Temat: bathonian - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Docodont nature of Cyrtlatherium, an upper Bathonian mammal from England
Autorzy:: Sigogneau-Russell, D
Powiązania:: https://bibliotekanauki.pl/articles/22248.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Cyrtlatherium
docodont
Middle Jurassic
mammal
Cyrtlatherium canei
England
tooth
Upper Bathonian
remains
Bathonian
Źródło:: Acta Palaeontologica Polonica; 2001, 46, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: New teeth of allotherian mammals from the English Bathonian, including the earliest multituberculates
Autorzy:: Butler, P M
Hooker, J.J.
Powiązania:: https://bibliotekanauki.pl/articles/22031.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: English Bathonian
tooth cusp
mammal
tooth
Allotheria
Jurassic
Bathonian
multituberculate
Haramiyida
dentition
new tooth
paleontology
Multituberculata
Opis:: Twenty one isolated multituberculate−like teeth are described from the Forest Marble (late Bathonian) of Oxfordshire and Dorset, England. Eighteen are additional to the teeth described as Eleutherodon oxfordensis by Kermack et al. (1998), and three of those are placed in new taxa. Six new molars of Eleutherodon provide further information on variation in size, proportion and root pattern. Millsodon superstes gen. et sp. nov. (family indeterminate), based on first and last lower molars and a referred upper molar, has resemblances to Haramiyidae and Theroteinidae. Kirtlingtonia catenata gen. et sp. nov. (family indeterminate), based on last upper molars and a probable upper premolar, has a slight resemblance to Eleutherodon, and also to M2 of some paulchoffatiid multituberculates. Kermackodon multicuspis gen. et sp. nov. (family Kermackodontidae nov.) and Hahnotherium antiquum gen. et sp. nov. (family Hahnotheriidae nov.) are based on second upper molars, recognised as multituberculate by their horizontal wear and inferred occlusal displacement with respect to m2. A lower molar referred to H. antiquum confirms this. A blade−like lower premolar and an upper premolar with conical cusps, referred to Kermackodon, are multituberculate−like, but distinctive. Divergence between the two Bathonian multituberculates indicates that the order originated much earlier, more probably from a haramiyid than from a morganucodontid source. Mojo is regarded as probably a haramiyid. The Hahnodontidae, which have basined wear, are removed from the Multituberculata to the “Haramiyida”.
Źródło:: Acta Palaeontologica Polonica; 2005, 50, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Discovery of Middle Jurassic mammals from Siberia
Autorzy:: Averianov, A O
Lopatin, A.V.
Skutschas, P.P.
Martynovich, N.V.
Leshchinskiy, S.V.
Rezvyi, A.S.
Krasnolutskii, S.A.
Fayngertz, A.V.
Powiązania:: https://bibliotekanauki.pl/articles/945775.pdf
Data publikacji:: 2005
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: docodonta
morganucodon
dentary
anatomy
bathonian
jurassic
siberia
Opis:: Mammal remains from the Middle Jurassic (Bathonian) Berezovsk Quarry on the south of Krasnoyarsk Territory, West Siberia, Russia are referred to Docodonta indet. (two edentulous fragmentary dentaries) and Mammalia indet. (a single−rooted tooth). The dentaries exemplify a unique combination of plesiomorphic characters found among stem mammals only in Docodonta and Morganucodon: well developed Meckel’s groove, trough for postdentary bones with overhanging medial ridge and a diagonal ridge on the floor separating the “adductor fossa” and angular facet, and well developed and posteroventrally directed pseudangular process with facet for the reflected lamina of angular. Both specimens share with Docodonta the prearticular facet placed ventral to the angular facet and extending posteriorly to the mandibular foramen. This facet is not present in Morganucodon, where the prearticular lies medial to the angular. Medial position of the prearticular in Morganucodon is connected with the compound jaw articulation in this genus, in which a rudimentary articular−quadrate mandibular joint is present medially to the dentary−squamosal joint. In Docodonta indet. from Berezovsk Quarry, Haldanodon and Docodon the position of the prearticular ventral to the angular is connected with the position of the articular complex ventral to the dentary condyle. Such articular complex could not function as a mandibular joint and postdentary bones in Docodonta were used solely for sound transmission. One specimen from Berezovsk Quarry shares with Morganucodon a groove for replacement dental lamina, which was not reported previously for Docodonta. Mammal remains from Berezovsk Quarry are among the oldest occurrences for Docodonta, the first record of Jurassic mammals for Siberia, and only second such record for the whole of Russia.
Źródło:: Acta Palaeontologica Polonica; 2005, 50, 4; 789-797
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Palaeoenvironmental implications of Middle Jurassic trace fossils from the Jaisalmer Formation, India, with emphasis on the ichnogenus Asteriacites Lumbricalis von Schlotheim
Autorzy:: Gurav, S.S.
Kulkarni, K. G.
Paranjape, A. R.
Borkar, V. D.
Powiązania:: https://bibliotekanauki.pl/articles/191728.pdf
Data publikacji:: 2014
Wydawca:: Polskie Towarzystwo Geologiczne
Tematy:: Asteriacites
Heliophycus
Bathonian
opportunistic colonisation
Jaisalmer Basin
Rajasthan
Opis:: The Hamira Member (Bathonian) of the Jaisalmer Formation records the first marine transgression within the Jaisalmer Basin. It also contains the ichnogenus Asteriacites von Schlotheim, 1820, as documented here for the first time. This was used to refine interpretations of the palaeoenvironment. Crowded ophiuroid resting traces, Asteriacites lumbricalis, occur in a silty limestone unit 1 m thick. This is preceded by a monospecific assemblage of Diplocraterion parallelum towards the base of this unit, while towards the top there is an assemblage, comprising Gyrochorte comosa, Protovirgularia rugosa, Rhizocorallium commune and Rosselia socialis. Colonisation by the Asteriacites trace makers occurred in a shallow-water, marginal-marine, normal-salinity, fully oxygenated, high-energy setting with steady rates of sedimentation. From an ichnological perspective, the sequence investigated shows a shift in environmental conditions from the middle shoreface to the off shore transition zone. Addressing the Asteriacites/Heliophycus nomenclatorial dilemma, Knaust (2012) suggested that the generic designation Asteriacites should be retained. His view was found to be appropriate and supported to avoid further confusion.
Źródło:: Annales Societatis Geologorum Poloniae; 2014, 84, 3; 249--257
0208-9068
Pojawia się w:: Annales Societatis Geologorum Poloniae
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Charakterystyka palinofacjalna najwyższego bajosu i batonu okolic Włocławka
Autorzy:: Barski, M.
Powiązania:: https://bibliotekanauki.pl/articles/2061390.pdf
Data publikacji:: 2003
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: paleośrodowisko
analiza palinofacjalna
bajos
baton
paleoenvironment
Bajocian
Bathonian
Źródło:: Volumina Jurassica; 2003, 1, 1; 7-12
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A preliminary report on dinosaur track assemblages from the Middle Jurassic of the Imilchil area, Morocco
Autorzy:: Gierliński, G. D.
Menducki, P.
Janiszewska, K.
Wicik, I.
Boczarowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2059246.pdf
Data publikacji:: 2009
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: dinosaur tracks
Bathonian
Bajocian
Central High Atlas
Morocco
Opis:: Dinosaur tracks are reported from three new localities near Imilchil, in the Central High Atlas of Morocco. New dinosaur track assemblages are recognized in Bathonian and Bajocian beds. The Bathonian track assemblage comprises theropod, sauropod and ornithopod footprints. The Bajocian deposits contain a sauropod-thyreophoran track assemblage.
Źródło:: Geological Quarterly; 2009, 53, 4; 477-482
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Docodonts from the British Mesozoic
Autorzy:: Sigogneau-Russell, D
Powiązania:: https://bibliotekanauki.pl/articles/22512.pdf
Data publikacji:: 2003
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: Mesozoic
Great Britain
docodont
Docodonta
Mammalia
Berriasian
Bathonian
paleontology
Opis:: This paper deals with new docodont teeth from the upper Bathonian of Forest Marble, collected by Prof. K.A. Kermack and his team, and from the basal Cretaceous of the Purbeck Limestone Group, collected by P. Ensom. Study of this materialled to the recognition of three new taxa: Borealestes mussettisp. nov. and Krusatodon kirtlingtonensis gen. et sp. nov. from Forest Marble, Peraiocynodon majorsp. nov. from Purbeck; this makes the Bathonian locality the richest (four species) docodont locality so far known. The possible synonymy of Cyrtlatherium–Simpsonodon (Forest Marble) and of Peraiocynodon–Docodon (Purbeck−Morrison) suggested by several authors is discussed. In conclusion, phyletic relationships between the known docodont genera are proposed, based on lower molars.
Źródło:: Acta Palaeontologica Polonica; 2003, 48, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Middle Jurassic-Early Cretaceous foraminiferal biozonation of the Amran Group, eastern Sana’a Basin, Yemen
Autorzy:: Al-Wosabi, M.
El-Anbaawy, M.
Al-Thour, K.
Powiązania:: https://bibliotekanauki.pl/articles/94217.pdf
Data publikacji:: 2017
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: biostratigraphy
Bathonian
Berriasian
Jabal Salab
Jabal Yam
biostratygrafia
baton
Berrias
Opis:: Two sections of strata assigned to the Amran Group at Jabal Salab and Jabal Yam in the eastern Sana’a governorate were sampled and correlated. These sections are part of a carbonate platform that extends from the city of Marib in the east to Naqil Ibn Ghailan, 20 km east of the city of Sana’a to the west. Palaeontological analysis of samples recovered has resulted in identification of 123 foraminiferal species, which are used to subdivide the sequence of the Amran Group into five biostratigraphic zones, aged between Bathonian (Middle Jurassic) and Berriasian (Early Cretaceous). The proposed biozones are those of Riyadhella rotundata, Kurnubia jurassica, Ammomarginulina sinaica, Alveosepta jaccardiand Pseudocyclammina sulaiyana/Furitilla caspianseis. These biozones were constructed and correlated with the equivalent zones reported from several localities.
Źródło:: Geologos; 2017, 23, 2; 75-87
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Comment on "Palaeoenvironmental control on distribution of crinoids in the Bathonian (Middle Jurassic) of England and France" by Aaron W. Hunter and Charlie J. Underwood
Autorzy:: Salamon, M.A.
Gorzelak, P.
Zaton, M.
Powiązania:: https://bibliotekanauki.pl/articles/23363.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
discussion
paleoenvironment control
distribution
crinoid
Bathonian
Middle Jurassic
England
France
Źródło:: Acta Palaeontologica Polonica; 2010, 55, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Biostratygrafia amonitowa formacji częstochowskich iłów rudonośnych (najwyższy bajos - górny baton) z odsłonięć w Częstochowie
Autorzy:: Matyja, B.
Wierzbowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2061401.pdf
Data publikacji:: 2003
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: biostratygrafia
amonity
iły rudonośne
baton
bajos
biostratigraphy
ammonites
ore bearing
Bathonian
Bajocian
Źródło:: Volumina Jurassica; 2003, 1, 1; 3-6
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Comment and reply on "Palaeoenvironmental control on distribution of crinoids in the Bathonian (Middle Jurassic) of England and France" by Aaron W. Hunter and Charlie J. Underwood
Autorzy:: Hunter, A.W.
Underwood, Ch.J.
Powiązania:: https://bibliotekanauki.pl/articles/20228.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
paleoenvironment control
discussion
distribution
crinoid
Bathonian
Middle Jurassic
Jurassic
England
France
Źródło:: Acta Palaeontologica Polonica; 2010, 55, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Palaeoenvironmental reconstruction of Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Gedl, P.
Kaim, A.
Leonowicz, P.
Boczarowski, A.
Dudek, T.
Kędzierski, M.
Rees, J.
Smoleń, J.
Szczepanik, P.
Sztajner, P.
Witkowska, M.
Ziaja, J.
Powiązania:: https://bibliotekanauki.pl/articles/138742.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: beton
iły rudonośne
jura
paleośrodowisko
Polska
Bathonian
Jurassic
ore-bearing clays
palaeoenvironment
Polska
Opis:: Multidisciplinary studies of the Middle-Upper Bathonian ore-bearing clays at Gnaszyn revealed variable palaeoenvironmental conditions during the deposition of this seemingly monotonous sequence. We interpret the conditions in the bottom environment and the photic zone, and also evaluate the influence of the adjacent land areas, based on sedimentology, geochemistry, sporomorphs and palynofacies composition, benthic (foraminifera, gastropods, bivalves, scaphopods, echinoderms), planktonic (calcareous nannoplankton, dinoflagellate cysts), and nektonic (sharks) fossils. The Gnaszyn succession originated relatively close to the shore, within reach of an intense supply of terrestrial fine clastic and organic particles. The latter are mainly of terrestrial origin and range from 1.5 to 2.5 wt.%. The precise water depth is difficult to estimate but most likely ranges from several tens of metres to a few hundred metres. All fossil groups show minor changes throughout the succession. As the climate seems to have been quite stable during this period we consider sea-level fluctuations to have been the main factor responsible for the changes. The terrestrial input, including freshwater and land-derived clastic and organic particles (sporomorphs and cuticles), increased during periods of sea-level lowstand. As a consequence, stress conditions (lower salinity, higher nutrient availability, lower water transparency) in the photic zone caused blooms of opportunistic planktonic taxa. Furthermore, a faster sedimentation rate led to oxygen depletion and deterioration of the living conditions in the bottom environment due to an increased accumulation of organic matter. As a result, the benthic biota became taxonomically impoverished and commonly dominated by juvenile forms. During periods of high sea level, the source areas were shifted away from the basin, resulting in a decrease in the terrestrial influx, increase in the salinity of surface waters, the appearance of more diverse phytoplankton assemblages, a lower sedimentation rate, and an improvement of living conditions at the bottom.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 463-484
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Biostratygrafia i paleośrodowisko środkowej jury z kamieniołomu Ogrodzieniec
Biostratigraphy and the Mid-Jurassic environment from the Ogrodzieniec quarry
Autorzy:: Barski, M.
Dembicz, K.
Praszkier, T.
Powiązania:: https://bibliotekanauki.pl/articles/2077304.pdf
Data publikacji:: 2004
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Jura Krakowsko-Częstochowska
biostratygrafia
Ogrodzieniec
amonity
Bathonian
Callovian
biostratigraphy
dinocysts
ammonites
Kraków-Częstochowa Upland
Opis:: The uppermost Bathonian and Callovian deposits from the newly exposed section of Ogrodzieniec were studied. The biostratigraphical analysis was based on both ammonite and dinocyst zonations. The uppermost Bathonian Orbis and Discus and the Callovian Herveyi, Jason, Coronatum, Athleta, Lamberti zones were distinguished. State of preservation of ammonites and lack of dinocysts made it impossible to distinguish Koenigi and Calloviense zones of the lowest Callovian. The position of the Bathonian/Callovian boundary was found in the clayey part of the section. Earlier the boundary was thought to be erosional. The new data indicate, however, the presence of continuous sedimentation, with low sedimentation rate, during Discus and Herveyi chrons. The presence of Gtenidodinium combazii in Orbis, Discus and Herveyi zones shows normal sea conditions in this time. The change of the dinocyst assemblage the Bathonian/Callovian boundary indicates the sea water cooling.
Źródło:: Volumina Jurassica; 2004, 2, 1; 61-68
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Palaeoenvironmental control on distribution of crinoids in the Bathonian [Middle Jurassic] of England and France
Autorzy:: Hunter, A W
Underwood, C.J.
Powiązania:: https://bibliotekanauki.pl/articles/22106.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleoecology
Middle Jurassic
England
paleoenvironment control
paleontology
Echinodermata
Crinoidea
Jurassic
France
distribution
Bathonian
crinoid
Opis:: Bulk sampling of a number of different marine and marginal marine lithofacies in the British Bathonian has allowed us to assess the palaeoenvironmental distribution of crinoids for the first time. Although remains are largely fragmentary, many species have been identified by comparison with articulated specimens from elsewhere, whilst the large and unbiased sample sizes allowed assessment of relative proportions of different taxa. Results indicate that distribution of crinoids well corresponds to particular facies. Ossicles of Chariocrinus and Balanocrinus dominate in deeper−water and lower−energy facies, with the former extending further into shallower−water facies than the latter. Isocrinus dominates in shallower water carbonate facies, accompanied by rarer comatulids, and was also present in the more marine parts of lagoons. Pentacrinitesremains are abundant in very high−energy oolite shoal lithofacies. The presence of millericrinids within one, partly allochthonous lithofacies suggests the presence of an otherwise unknown hard substrate from which they have been transported. These results are compared to crinoid assemblages from other Mesozoic localities, and it is evident that the same morphological adaptations are present within crinoids from similar lithofacies throughout the Jurassic and Early Cretaceous.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 1; 77-98
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Calcareous nannofossils from the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn as palaeoenvironmental indicator, Kraków-Silesia Homocline, Poland
Autorzy:: Kędzierski, M.
Powiązania:: https://bibliotekanauki.pl/articles/139434.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
jura
monoklina śląsko-krakowska
paleośrodowisko
Bathonian
calcareous nannofossils
Jurassic
Kraków-Silesia Homocline
palaeoenvironment
Polska
Opis:: Qualitative and quantitative studies on calcareous nannofossils have been carried out on the Middle-Upper Bathonian succession of Gnaszyn (Kraków-Silesia Homocline, Częstochowa region). The nannofossil assemblages are moderately or well-preserved and are dominated by Watznaueria britannica; also common are Staurolithites lumina and Zeugrhabdotus erectus. The presence of delicate nannofossil forms together with dissolution-resistant taxa shows that the changes in composition of some of the nannoplankton assemblages reflect original variations. The frequency and diversity changes of the calcareous nannofossil assemblages have been interpreted in relation to fluctuations of sedimentation rate versus changes in trophic conditions within the photic zone. The highest diversity assemblages contain a high percentage of palaeofertility indicators, and are impoverished in the genus Watznaueria. This is interpreted as a reflection of a lower sedimentation rate and more stable, possibly mesotrophic conditions within the photic zone. On the other hand, W. britannica-dominated assemblages with low species diversity may represent more unstable environments with a high influx of terrestrial material related to a high sedimentation rate and a high nutrient influx, i.e. eutrophic conditions in the photic zone.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 421-437
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 16.

Tytuł:: Faunal dynamics of gastropods in the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Kaim, A.
Powiązania:: https://bibliotekanauki.pl/articles/138635.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
Gnaszyn
iły rudonośne
jura
paleoekologia
Polska
ślimaki
Bathonian
gastropods
Jurassic
ore-bearing clays
palaeoecology
Polska
Opis:: The succession of gastropods in the Gnaszyn section is quite monotonous and shows significant changes only in the proximity of concretion layers, at least partially because of diagenetic reasons. Otherwise, the section is dominated by gastropods (cylidrobullinids, bullinids, and mathildids) most of which preyed probably on sedentary organisms (polychaetes and/or coelenterates) that possibly flourished on the sea bottom at that time. The other groups of gastropods are represented by larval or juvenile shells. Their presence shows that the environmental conditions that were probably unfavourable for gastropods living directly on the sea bottom most likely because of a soupy substrate consistency, possible oxygen deficiency near the sediment-water interface and/or oxygen content fluctuations. Adult and/or subadult individuals of these gastropods occur only in the higher part of the section, reflecting a time when these conditions improved. A new heterostrophic gastropod species, Promathildia gedli, is described.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 367-380
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 17.

Tytuł:: Palaeoecological implications of neoselachian shark teeth from the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Rees, J.
Powiązania:: https://bibliotekanauki.pl/articles/138736.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
Gnaszyn
jura
monoklina śląsko-krakowska
paleoekologia
Polska
Bathonian
Jurassic
Kraków-Silesia Homocline
Neoselachii
palaeoecology
Polska
Opis:: Systematic sampling through the Middle and Upper Bathonian strata at Gnaszyn has resulted in the discovery of 13 neoselachian teeth. Systematically, the teeth represent five taxa including Sphenodus sp., Protospinax sp. 1, Protospinax sp. 2, Palaeobrachaelurus sp. and another, indeterminate orectolobiform. The presence of two species of the flattened and bottom-dwelling Protospinax and two different orectolobiforms that are likely to have lived near the bottom, is a strong indication of oxygenated bottom conditions at the time of deposition. The dietary preferences of these taxa included a wide variety of benthic invertebrates. The synechodontiform Sphenodus may have been the first pelagic predatory neoselachian in the Jurassic, equipped with high and slender piercing teeth that formed a tearing-type dentition. The diet of Sphenodus probably included bony fish, smaller sharks and cephalopods.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 397-402
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 18.

Tytuł:: Bathonian ammonites of the families Sphaeroceratidae Buckman and Tulitidae Buckman from the Polish Jura Chain (Southern Poland)
Autorzy:: Kopik, J.
Powiązania:: https://bibliotekanauki.pl/articles/1205014.pdf
Data publikacji:: 2006
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: amonity
taksonomia
biostratygrafia
baton
jura środkowa
południowa Polska
ammonites
taxonomy
biostratigraphy
Bathonian
Middle Jurassic
southern Poland
Opis:: Szczegółowym badaniom poddano znaleziska dolno- i środkowobatońskich amonitów, należących do rodzin Sphaeroceratidae Buckman i Tulitidae Buckman, pochodzące z serii osadów mułowcowo-ilastych, wchodzących w skład środkowojurajskiej formacji osadowej Jury Polskiej (Polish Jura Chain) częstochowskich iłów rudonośnych. Amonity występowały najczęściej w sferosyderytach, odsłaniających się w licznych gliniankach na obrzeżach Częstochowy oraz w podziemnych wyrobiskach kopalnianych w rejonie Włodowic i Zawiercia. Rodzinę Sphaeroceratidae Buckman, w tym zespole fauny, charakteryzował jeden, dobrze zachowany, pochodzący z dolnego batonu okaz. Należy on do bardzo rzadko stwierdzanego rodzaju Praetulites Westermann (P. rugosus sp. nov.). Znaleziony w kopalni rud żelaza we Włodowicach reprezentuje najmłodsze, z dotychczas poznanych, ogniwo ewolucyjne rodzaju Praetulites. Rodzina Tulitidae była w badanym zespole amonitów znacznie liczniej reprezentowana. Tworzy ją szereg gatunków, często nowych, należących do rodzajów i podrodzajów: Tulites Buckman, Rugiferites Buckman, Morrisiceras Buckman i Holzbergia Torrens (podrodzina Tulitinae Callomon, Dietl, Niederhöfer) oraz taksony podrodziny Bullatimorphitinae Callomon, Dietl, Niederhöfer, na którą składają się gatunki rodzajów Sphaeroptychius Lissajous i Bullatimorphites Buckman. Szczególnie interesująca okazała się ocena wieku znalezionego we Włodowicach i Rudnikach, oraz w bliżej nieokreślonym stanowisku w okolicach Częstochowy, zespołu gatunków z podrodzajów Tulites i Rugiferites. Wbrew dotychczasowym poglądom o ich wyłącznym występowaniu w europejskim środkowym batonie (poziom Tulites subcontractus), znaleziska te odkryte zostały w dolnym batonie. Reprezentowane były zarówno przez nowe gatunki, jak i przez taksony dotychczas uznawane za typowe dla zachodnioeuropejskiego batonu środkowego. Kolejni reprezentanci podrodziny Tulitinae (Morrisiceras, Holzbergia) i Bullatimorphitinae (Sphaeroptychius, Bullatimorphites) zgodnie z dotychczasowymi obserwacjami grupowały się w wyższych odcinkach środkowego batonu. Bardzo dobry na ogół stan ich zachowania (zsyderytyzowane ośródki z końcowymi stadiami wzrostowymi muszli) pozwalał częstokroć uzupełniać dotychczasowe diagnozy gatunkowe.
Źródło:: Polish Geological Institute Special Papers; 2006, 21; 1-68
1507-9791
Pojawia się w:: Polish Geological Institute Special Papers
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 19.

Tytuł:: Palaeoenvironmental interpretation of echinoderm assemblages from Bathonian ore-bearing clays at Gnaszyn (Kraków-Silesia Homocline, Poland)
Autorzy:: Boczarowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/138733.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
iły rudonośne
jura środkowa
paleośrodowisko
Polska
szkarłupnie
Bathonian
echinoderms
Middle Jurassic
ore-bearing clays
palaeoenvironment
Polska
Opis:: This paper presents the results of an investigation into the variability of echinoderm assemblages from Bathonian ore-bearing clays from Gnaszyn. Remains of Crinoidea, Asteroidea, Ophiuroidea, Echinoidea, and Holothuroidea have been studied from 38 rock samples. The most common echinoderms represented are the crinoids Balanocrinus berchteni and Chariocrinus andreae and a few species of the holothurian genera Priscopedatus, Calclamna, Staurocaudina, Eocaudina, Achistrum, Theelia and Hemisphaeranthos. The echinoderms from Gnaszyn show various life strategies: benthic or epibenthic forms, sessile sestonophages (Crinoidea), motile macrophages (Asteroidea) and detritivores (Asteroidea, Ophiuroidea, Echinoidea), infaunal and epifaunal detritus feeders, sediment feeders or rake-feeders (Holothuroidea). Their presence suggests well oxygenated and presumably relatively cold bottom marine waters. The parts of the Gnaszyn section around concretion horizons and characterized by the ubiquitous occurrence of the holothurian Theelia and echinoids were deposited during phases of optimal living conditions with sufficient influx of plant detritus and good oxygenation of the sea bottom. These parts commonly host echinoderm associations dominated by crinoid remains, which occasionally are still articulated (or disarticulated but remaining intact) - this points to a quiet environment with normal oxygenation of the bottom waters but anaerobic/dysaerobic conditions in the sediment.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 351-366
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 20.

Tytuł:: Faunal dynamics of bivalves and scaphopods in the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Kaim, A.
Sztajner, P.
Powiązania:: https://bibliotekanauki.pl/articles/138633.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
Gnaszyn
iły rudonośne
jura
łódkonogi
małże
paleoekologia
Polska
ślimaki
Bathonian
bivalves
gastropods
Jurassic
ore-bearing clays
palaeoecology
Polska
Scaphopods
Opis:: The environment at the Gnaszyn section - as deduced from bivalve and scaphopod dynamics - was controlled by the substrate consistency and possibly oxygen deficiency near the sediment-water interface and/or oxygen content fluctuations. The middle part of the section dominated by nuculoid and corbulid bivalves and Laevidentalium-type scaphopods probably reflects a soupy substrate and possibly oxygen deficiency in the sediment. Slightly coarser and better-oxygenated silts in the upper and lower parts of the section offered a less soupy substrate consistency, allowing the development of communities dominated by astartids, byssate bivalves, and Dentalium- and Plagioglypta-type scaphopods.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 381-395
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 21.

Tytuł:: Detailed biostratigraphic scales as based on the palaeobiogenetical approach (an example of the Upper Bajocian – Lower Bathonian ostracod scale of the Russian Platform)
Autorzy:: Shurupova, Y. A.
Tesakova, E. M.
Powiązania:: https://bibliotekanauki.pl/articles/2060983.pdf
Data publikacji:: 2017
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: palaeobiogenetic method
biostratigraphy
ostracods
new species
Bajocian
Bathonian
Saratov Volga Region
heterochrony
metoda paleobiogenetyczna
biostratygrafia
małżoraczki
nowe gatunki
Bajos
baton
Opis:: Two new species of ostracods of the family Progonocytheridae Sylvester-Bradley Camptocythere (C.) lateres Tesakova et Shurupova, sp. nov. and C. (C.) angustius Tesakova et Shurupova, sp. nov. from the Michalskii and Besnosovi ammonite zones (Upper Bajocian – Lower Bathonian, Middle Jurassic) of the Sokur section (Saratov) are described. The changes in ontogenesis in the phylogeny of Camptocythere (C.) lateres Tesakova et Shurupova in the stratigraphical interval corresponding to the Palaeocytheridea kalandadzei ostracod Zone, and especially to the beds with C. (C.) lateres, have been studied. The levels of the change in the predominant type of sculpture (corresponding to evolutionary boundaries) are recognized in the sculpture development among the adult representatives of the species in its phylogeny. This palaeobiogenetic (heterochrony) approach allows subdivision of the beds with C. (C.) lateres into three stratigrapical intervals characterized by changes in the type of sculpture.
Źródło:: Volumina Jurassica; 2017, 15, 1; 121--138
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 22.

Tytuł:: Pedicellarie ze środkowojurajskich iłów rudonośnych i ich znaczenie w strategii życiowej jeżowców
Pedicellariae from Middle Jurassic Ore Bearing Częstochowa Clay Formation and their significance in echinoids life strategy
Autorzy:: Boczarowski, A.
Powiązania:: https://bibliotekanauki.pl/articles/2077294.pdf
Data publikacji:: 2004
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: taksonomia
anatomia
paleośrodowisko
jura
bajos
baton
centralna Polska
iły rudonośne
taxonomy
anatomy
paleoenvironment
Jurassic
Bajocian
Bathonian
Central Poland
pedicellariae
ore bearing
Opis:: Numerous, well-preserved globiferous and ophiocephalous pedicellariae of echinoids have been found in samples from several brickyards of Central Poland: Gnaszyn and Kawodrza (Częstochowa), Blanowice (Zawiercie), Wrzosowa. This is the first study of the uppermost Bajocian and Bathonian pedicellariae from the Ore Bearing Częstochowa Clay Formation. Four new morphotypes are described. Effectiveness of the defensive echinoid strategy is discussed; the structures observed indicate the presence of poison in some but not all spines and pedicellariae of both living and fossil species. All main morphological types of pedicellariae are compared. Morphotype I of globiferous pedicellariae and morphotype III of ophiocephalous pedicellariae are similar to those from the recent family Parechinidae. Jurassic echinoid Pelanechinus has ophiocephalous pedicellariae reminding morphotype II, as described from the Polish Bathonian.
Źródło:: Volumina Jurassica; 2004, 2, 1; 141-150
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 23.

Tytuł:: An introduction to the palaeoenvironmental reconstruction of the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Gedl, P.
Kaim, A.
Powiązania:: https://bibliotekanauki.pl/articles/138596.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
iły rudonośne
jura środkowa
monoklina śląsko-krakowska
osady
Polska
Bathonian ore-bearing clays
Dark deposits
Kraków-Silesia Homocline
Middle Jurassic
Polska
Opis:: This paper provides introductory data for multidisciplinary studies on palaeoenvironmental reconstructions of the Bathonian (Middle Jurassic) ore-bearing clays exposed at Gnaszyn, southern Poland. These dark-coloured fine-clastic deposits have been studied for micropalaeontology, sedimentology and geochemistry (published in separate papers within this volume). Brief outlines of the Middle Jurassic palaeogeography of the Polish epicontinental basin and the geology of the Kraków-Silesia Homocline are given. A description of the ore-bearing clays succession exposed in the clay-pit at Gnaszyn is provided, including locations of the sections studied, their ammonite biostratigraphy, brief lithology and macrofossil distribution. The sample positions collected for micropalaeontological and geochemical studies are specified.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 267-280
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 24.

Tytuł:: Palynofacies from Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland, with special emphasis on sporomorph eco-groups
Autorzy:: Gedl, P.
Ziaja, J.
Powiązania:: https://bibliotekanauki.pl/articles/138745.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
epikontynentalny zbiornik
iły rudonośne
jura środkowa
paleogegrafia
palinofacja
Polska
sporomorf
Bathonian
epicontinental basin
Middle Jurassic
ore-bearing clays
palaeogeography
palynofacies
Polska
sporomorphs
Opis:: The palynological organic matter of dark clays from Bathonian ore-bearing clays exposed at Gnaszyn (Częstochowa, Kraków-Silesia Homocline, Poland) consists of high proportions of land-derived particles; aquatic elements (mainly dinoflagellate cysts) are comparatively rare. Terrestrial particles include black opaque phytoclasts, dark brown phytoclasts, cuticle remains and subordinate sporomorphs. The latter are represented by eighty-four taxa of spores and pollen grains. They represent various groups of plants, including Bryophyta, Sphenophyta, Lycophyta, Pteridophyta, Pteridospermophyta, Cycadophyta or Ginkgophyta and Coniferophyta. The most frequent sporomorphs in almost all samples from Gnaszyn are Callialasporites (Araucariaceae), Cerebropollenites and Perinopollenites elatoides (Taxodiaceae) pollen grains, fern spores with triradiate tetrad mark, bisaccate pollen grains belonging to conifers (Pinaceae or Podocarpaceae) and also to Pteridospermophyta. Quantitative analysis of the palynofacies shows fluctuations of particular element ratios, which correlate with lithology. Clay intervals that contain siderite concretion levels yielded lower amounts of cuticles in relation to sporomorphs (mainly pollen grains) and dinoflagellate cysts. Intervals of monotonous clays and silts are characterized by a higher ratio of cuticles in relation to other elements, especially dinoflagellate cysts. Also, quantitative analysis of the sporomorphs shows changes in frequency of the representatives of various plant communities, which coexisted during the Jurassic: Upland, Lowland, River, Pioneer, Coastal and Tidally-influenced. These changes might have reflected sealevel fluctuations, which affected vegetation growing on adjacent land. However, the dominance of Callialasporites pollen grains, which belong to the Coastal community, indicates that the Gnaszyn assemblage was mainly influenced by the seashore vegetation. The high frequency of Araucariaceae pollen grains and the presence of ferns representing the Osmundaceae, Cyatheaceae, Dicksoniaceae, Schizeaceae, Gleicheniaceae and Matoniaceae indicate a warm climate without large seasonal amplitudes during the deposition of the Gnaszyn succession.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 325-349
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 25.

Tytuł:: Organic-walled dinoflagellate cysts from the Bathonian ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland - a palaeoenvironmental approach
Autorzy:: Gedl, P.
Powiązania:: https://bibliotekanauki.pl/articles/138764.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
dinocysty
iły rudonośne
jura środkowa
monoklina śląsko-krakowska
paleośrodowisko
Polska
Bathonian
dinoflagellate cysts
Kraków-Silesia Homocline
Middle Jurassic
ore-bearing clays
palaeoenvironment
Polska
Opis:: A succession of Middle-Upper Bathonian (Subcontractus.Retrocostatum zones) ore-bearing clays exposed at Gnaszyn has been investigated for the presence of dinoflagellate cysts. The assemblages are dominated by Ctenidodinium. However, analysis of diversity shows some subtle differences throughout the succession, possibly related to the palaeoenvironmental conditions in the photic zone. Impoverished assemblages, dominated by Ctenidodinium, occur mainly in monotonous muddy intervals. More diverse assemblages, albeit also dominated by Ctenidodinium, occur in intervals which contain siderite concretion levels. The taxonomic composition of the former assemblage seems to reflect slightly restricted conditions in the photic zone, possibly related to a minor reduction in salinity and/or increase in nutrient availability. More diverse dinoflagellate cyst assemblages reflect periods of less intense terrigenous influx and relatively higher, possibly normal, salinity. These changes were possibly caused by variable intensity of freshwater influx into the basin, controlled by sea-level fluctuations. Sea-level changes may be related to migrations of Tethyan water masses, which were probably partly responsible for the composition of the dinoflagellate cyst assemblages.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 439-461
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:: A new large-bodied theropod dinosaur from the Middle Jurassic of Warwickshire, United Kingdom
Autorzy:: Benson, R.B.J.
Radley, J.D.
Powiązania:: https://bibliotekanauki.pl/articles/22445.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: large-bodied dinosaur
dinosaur
new dinosaur
theropod dinosaur
Middle Jurassic
Jurassic
Warwickshire
United Kingdom
paleontology
Dinosauria
Theropoda
Tetanurae
Megalosaurus
Cruxicheiros
Bathonian
Chipping Norton Limestone Formation
Opis:: Previously undocumented postcranial material from the Chipping Norton Limestone Formation (Middle Jurassic: Lower Bathonian) of Cross Hands Quarry, near Little Compton, Warwickshire represents a new large−bodied theropod dinosaur, distinct from the contemporaneous Megalosaurus bucklandii. Cruxicheiros newmanorum gen. et sp. nov. is diagnosed by a single autapomorphy, the presence of a proximomedially inclined ridge within the groove that marks the lateral extent of the posterior flange of the femoral caput (trochanteric fossa). C. newmanorum shows three tetanuran features: widely separated cervical zygapophyses, a swollen ridge on the lateral surface of the iliac blade and an anterior spur of the caudal neural spines. However, due to fragmentary preservation its affinities within Tetanurae remain uncertain: phylogenetic analysis places it as the most basal tetanuran, the most basal megalosauroid (= spinosauroid) or the most basal neotetanuran.
Źródło:: Acta Palaeontologica Polonica; 2010, 55, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 27.

Tytuł:: Life span and growth rate of Middle Jurassic mesohibolitid belemnites deduced from rostrum microincrements
Autorzy:: Wierzbowski, H.
Powiązania:: https://bibliotekanauki.pl/articles/2061020.pdf
Data publikacji:: 2013
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: belemnite rostra
belemnites
growth rings
Polish Jura Chain
Bathonian
Ore Bering Częstochowa Clay Formation
rostry belemnitów
belemnity
pierścienie wzrostu
Wyżyna Krakowsko-Częstochowska
baton
formacja częstochowskich iłów rudonośnych
Opis:: The microincrements of nine Middle Jurassic mesohibolitid belemnite rostra (Hibolithes jurensis, Pachybelemnopsis fusiformis and Pachybelemnopsis “subhastatus”) were analysed to measure the ontogenic age and growth rate of the belemnites. The microincrements are interpreted to have been formed daily based on analogy with extant coleoid cephalopods and the frequency of circadian rhythms in animal activity. The mesohibolitid belemnites are found to have had a short life span of ca. 1 year. The short life span of the belemnites studied is similar to the life span of modern coleoids (squids, cuttlefishes and common octopuses). It restricts the utility of belemnite rostra as a proxy for average secular seawater temperatures and chemistry. Short-lived cycles (2–8 days) in the belemnite growth rate are linked to variations in the metabolic activity of these animals. Minor diagenetic alteration revealed by the dull cathodoluminescence of some rostra is found to have no effect on the preservation of the growth rings.
Źródło:: Volumina Jurassica; 2013, 11, 1; 1--18
1896-7876
1731-3708
Pojawia się w:: Volumina Jurassica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 28.

Tytuł:: Middle Jurassic cyclostome bryozoans from the Polish Jura
Autorzy:: Zaton, M
Taylor, P.D.
Powiązania:: https://bibliotekanauki.pl/articles/20460.pdf
Data publikacji:: 2009
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: paleontology
Middle Jurassic
cyclostome bryozoan
Polish Jura
bryozoan
Bryozoa
Cyclostomata
Bajocian
Bathonian
Microeciella annae
Microeciella kuklinskii
Microeciella maleckii
Microeciella mokrskoensis
Microeciella magnopora
Reptomultisparsa harae
Hyporosopora bugajensis
Stenolaemata
Opis:: New collections of bryozoans from the Middle Jurassic (Late Bajocian and Bathonian) of Poland add significantly to our knowledge of the diversity and biogeography of the Cyclostomata at a time when they were the dominant bryozoan order in the fossil record. A total of 16 species and one form−genus (“Berenicea”) are present. Most are encrusters, predominantly on hiatus concretions. A single erect species was found in deposits interpreted as regurgitates of a marine vertebrate. The following new species are described: Microeciella annae sp. nov., M. kuklinskii sp. nov., M. maleckii sp. nov., M. mokrskoensis sp. nov., M. magnopora sp. nov., Reptomultisparsa harae sp. nov., and Hyporosopora bugajensis sp. nov. The taxonomic importance of the morphology of both the gonozooids and pseudopores is underlined, especially for encrusting species of the “Berenicea” type that are otherwise difficult to distinguish from one another. The described bryozoan assemblage encrusting hiatus concretions from the Polish Middle Jurassic is the richest that has been documented globally from this kind of substrate.
Źródło:: Acta Palaeontologica Polonica; 2009, 54, 2; 267-288
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 29.

Tytuł:: Palaeoenvironmental significance of iron carbonate concretions from the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland
Autorzy:: Witkowska, M.
Powiązania:: https://bibliotekanauki.pl/articles/138739.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: baton
bioturbacja
jura
konkrecja syderytu
monoklina śląsko-krakowska
paleośrodowisko
Polska
redoks
wczesna diageneza
Bathonian
bioturbation
Cracow-Silesia Homocline
early diagenesis
Jurassic
palaeoenvironment
Phosphate-siderite concretions
Polska
Redox boundary
Siderite concretions
Opis:: Iron carbonate concretion horizons are characteristic features of the Bathonian (Middle Jurassic) claystone-mudstone succession at Gnaszyn. They occur in single horizons, which generally represent the same genetic type. The siderite concretions are the main type of iron carbonate concretions at Gnaszyn; a second type is represented by phosphate-siderite concretions. On the basis of the fieldwork, and their petrographical and mineralogical characteristics, the genesis of the concretions and their palaeoenvironmental significance is discussed. The results of this study (based on the localization, mode of occurrence, mineralogy of iron carbonate concretions and also the textural relationship between the concretions and host sediment layers) suggest an early diagenetic origin of the concretions. The preferential occurrence of the concretion horizons in single layers in the ambient sediments was associated with particular conditions of their deposition and early diagenesis, favored by a slower sedimentation rate and more intense bioturbation, and related primarily to the greater availability of reactive iron ions. From the viewpoint of physicochemical conditions the horizons with iron carbonate concretions in the study area reflect the redox boundary between oxic/bioturbated and anoxic/non-bioturbated zones. The conditions favoring the formation of such horizons was possibly due to longer periods of diminished sedimentation rate when the redox boundary remained in the same position within the sediment.
Źródło:: Acta Geologica Polonica; 2012, 62, 3; 307-324
0001-5709
Pojawia się w:: Acta Geologica Polonica
Dostawca treści:: Biblioteka Nauki

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