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Wyświetlanie 1-15 z 56
Tytuł:
Jurassic ammonites of the Wulong area, Tingri County, Tibet
Autorzy:
Morton, N.
Meister, Ch.
Ruellau, L.
Shi, X.
Powiązania:
https://bibliotekanauki.pl/articles/2061072.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
Jurassic
Tibet
systematics
biostratigraphy
amonity
jura
Tybet
systematyka
biostratygrafia
Opis:
The Jurassic succession west of Wulong village, Tingri County, southern Tibet, is described. Lithostratigraphical classification uses pre-existing terminology for formations, and an informal subdivision into members is proposed. An important structural dislocation, in the form of a small-scale flower structure, affects the Zhamure Formation straddling the Triassic/Jurassic boundary but does not affect the underlying Derirong Formation (Rhaetian) or the overlying Wulong Formation (Lower Jurassic). No other major structural discontinuities could be recognised. New finds of ammonites in situ include a new genus and species of possible schlotheimiid, Womalongiceras inflatum, with a probable age of Sinemurian or slightly younger. Two separate beds yielded rich assemblages of crushed ammonites identified as Nyalamoceras nyalamensis Chao and Wang (1956) here interpreted as a hammatoceratid. The age of these is reinterpreted as uppermost Aalenian on the basis of an accompanying specimen of ?Pseudolioceras (Tugurites) sp. nov. and poorly preserved ammonites from higher beds identified as graphoceratids (?Graphoceras).
Źródło:
Volumina Jurassica; 2015, 13, 2; 1--21
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pseudothurmanniid ammonites from quarries near Lietavská Lúčka and their stratigraphical significance (Late Hauterivian, Central Western Carpathians, Slovakia)
Autorzy:
Vašiček, Z.
Malek, O.
Powiązania:
https://bibliotekanauki.pl/articles/2060607.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
taxonomy
stratigraphy
Hauterivian
Western Carpathians
Opis:
Pseudothurmanniid ammonites within Upper Hauterivian calcareous deposits are present in quarries on Polomec Hill near the village of Lietavská Lúčka, Slovakia. These deposits belong to the Mráznica Formation of the Krížna Nappe that is a part of the Fatricum Unit in the Central Western Carpathians. Nine ammonite species are described in detail, one of which, Binellicerasmichalíki, is new. The species identified indicate the Upper Hauterivian Balearis and Ohmi ammonite zones. The zone of the uppermost Hauterivian, Catulloi Zone, is not documented as far as pseudothurmanniid ammonites are concerned. The lackof developmentally younger representatives of the pseudothurmanniid ammonites neitherin the studied locali ty, nor in other Slovak locali ties, is explained by marked changes in the northern Tethyan margin in Europe duri ng the latest Hauterivian.
Źródło:
Geological Quarterly; 2017, 61, 3; 613--631
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonites from the Oxfordian-Kimmeridgian boundary and the Lower–Upper Kimmeridgian of Kachchh, western India
Autorzy:
Pandey, D.
Alberti, M.
Fürsich, F.
Głowniak, E.
Olóriz, F.
Powiązania:
https://bibliotekanauki.pl/articles/2061026.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
Kachchh
India
Oxfordian-Kimmeridgian boundary
amonity
Indie
Opis:
Several new specimens of ammonites from the Oxfordian and Kimmeridgian of Kachchh, western India, are described and illustrated. The Oxfordian ammonites ?Subdiscosphinctes Malinowska, Perisphinctes Waagen, Dichotomoceras Buckman, and ?Larcheria Tintant, all from Bharodia in the Wagad Uplift, enable tentative biochronostratigraphic correlations with the uppermost Middle Oxfordian up to the lower Upper Oxfordian of the unified Submediterranean zonation, whereas the Kimmeridgian ammonites Streblites Hyatt, “Orthosphinctes” Schindewolf, Torquatisphinctes Spath, Pachysphinctes Dietrich, Katroliceras Spath, Aspidoceras Zittel, and Schaireria Checa reconfirm a stratigraphic gap embracing incompletely known parts of the uppermost Oxfordian and the Lower Kimmeridgian as known from the ammonite records of the Kachchh Mainland of the Kachchh Basin.
Źródło:
Volumina Jurassica; 2013, 11, 1; 97--146
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonites and ammonite stratigraphy of the uppermost Jurassic (Tithonian) of the Owadów–Brzezinki quarry (central Poland)
Autorzy:
Martja, B.
Wierzbowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2060990.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
stratigraphy
correlation
Tithonian
palaeogeography
Volgian
Bolonian–Portlandian
amonity
stratygrafia
korelacja
tyton
paleogeografia
Opis:
The Tithonian ammonite succession at the Owadów–Brzezinki quarry, central Poland shows the presence of Subboreal ammonites of both NE European (“Volgian”) and NW European (“Bolonian–Portlandian”) affinity, making possible the correlation between the relevant ammonite subdivisions. The former are represented by Zaraiskites – Z. regularis Kutek and Z. zarajskensis (Michalski) as well as an early form of Virgatites – V. gerassimovi Mitta which enable the recognition of the upper part of the Scythicus Zone (the Zaraj¬skensis Subzone) and the lower part of the Virgatus Zone (the Gerassimovi Subzone) of the “Middle Volgian”. The latter are represented by Virgatopavlovia, which enables the correlation with the Fittoni Zone of the uppermost “Bolonian”, and by still younger assemblage of small-sized virgatitids – such as V. pusillus (Michalski), showing similarity to Progalbanites albani (Arkell) of the Albani Zone of the lowermost “Portlandian”. The new species established include: Zaraiskites lewinskii sp. nov. which represents a new member of the virgatitid lineage linking an older Z. pommerania (Arkell) with younger small-sized Virgatites, as well as two species of the genus Virgatopavlovia – V. janeki sp. nov. and V. dembowskae sp. nov. The appearance of ammonites of NW and NE European affinity in central Poland resulted from the opening of the new sea routes possibly related with tectonic activity in northern European areas at the transition from Early to Late Tithonian.
Źródło:
Volumina Jurassica; 2016, 14, 1; 65--122
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The succession of ammonites of the genus Amoeboceras in the Upper Oxfordian – Kimmeridgian of the Nordvik section in northern Siberia
Autorzy:
Rogov, M.
Wierzbowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2061366.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
Jurassic
Oxfordian
Kimmeridgian
biostratigraphy
Boreal Province
correlation
paleobiogeography
Opis:
A collection of ammonites of the genus Amoeboceras located carefully in the section of Nordvik Peninsula in northern Siberia has enabled recognition of the standard Boreal ammonite zones of the Upper Oxfordian and Kimmeridgian. The recognition of the standard Amoeboceras zones, well known in NW Europe and the Barents Sea area, in northern Siberia indicates the uniform character of the Late Oxfordian and Kimmeridgian ammonite faunas across the whole Boreal Province. Some comments on the occurrence of Boreal oppeliids of the genus Suboxydiscites in the studied section are also given.
Źródło:
Volumina Jurassica; 2009, 7, 1; 147-156
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Sinemurian to lowermost Toarcian ammonites of the Brescian Prealps (Southern Alps, Italy): preliminary biostratigraphical framework and correlations
Autorzy:
Meister, Ch.
Schirolli, P.
Dommergues, J-L.
Powiązania:
https://bibliotekanauki.pl/articles/2061352.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Early Jurassic
ammonites
lithostratigraphy
biostratigraphy
rifting
Val Trompia-Sebino Basin
Botticino High
Southern Alps
Brescian Prealps
Italy
Opis:
A set of 28 ammonite biohorizons or faunal assemblages is proposed for the Sinemurian, the Pliensbachian and the lowermost Toarcian of the Brescian Prealps, in part based on the published data of the authors of this contribution and partly on new results, derived both from recent field investigations and from the study of the historical collection of Lower Jurassic ammonites preserved in the Museum of Natural Sciences of Brescia (Northern Italy). The biohorizons are present in the Liassic carbonate succession of the Brescian Prealps, cropping out between the eastern surroundings of Brescia (Botticino), to the east, and Lake Iseo, to the west. Since the Hettangian this region was subjected to Jurassic rifting. The area of study was located on the eastern border of the wide Lombardian Basin, a part of the southern continental passive margin of Tethys. An articulated fault-system, trending from Brescia to the North, separated the western subsiding area of the Val Trompia-Sebino Basin from the eastern Botticino structural high. After the drowning of the Rhetian-Hettangian Corna Platform, the very thick synrift succession of the Medolo Group accumulated in the Val Trompia-Sebino Basin, whereas the coeval reduced sequence of the Rezzato Encrinite and the overlying Botticino Corso Rosso covered the Botticino High, subsequent to the Early Sinemurian. The ammonite biohorizons and assemblages recognised are quite well integrated and correlable with either the NW European standard zonation or the different zonations proposed for the Tethyan Realm.
Źródło:
Volumina Jurassica; 2009, 7, 1; 9-18
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Additional Tithonian and Berriasian ammonites from the Vaca Muerta Formation in Pampa Tril, Neuquén Basin, Argentina
Autorzy:
Parent, H.
Schweigert, G.
Scherzinger, A.
Garrido, A. C.
Powiązania:
https://bibliotekanauki.pl/articles/2060977.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
sexual dimorphism
Tithonian
Berriasian
Neuquen Basin
Vaca Muerta Formation
amonity
dymorfizm płciowy
tyton
Berrias
Basen Neuquen
Formacja Vaca Muerta
Opis:
The ammonite fauna of the Tithonian–Berriasian of the Vaca Muerta Formation in Pampa Tril has been recently described in detail. New important specimens and additional information are presented in this paper. The phyletic evolution of Choicensisphinctes, passing from C. platyconus to C. erinoides is confirmed, as well as the sexual dimorphic correspondence of this latter with C. mendozanus. A microconch of the genus Krantziceras is described for the first time. New specimens of Substeueroceras koeneni identical to the paralec¬totype, along with material already described from the koeneni Hz. (Koeneni Zone), point to the fixation of this horizon as the type horizon of the species. New specimens of Subthurmannia boissieri from the Damesi Zone match clearly the range of variation of this species in Spain, thus providing an element for time-correlation with the Tethyan standard scale. Additional material from the internispinosum alpha Hz. confirms the origin of W. internispinosum from C. proximus by the inception of an evolutionary innovation in the juvenile ontogeny.
Źródło:
Volumina Jurassica; 2017, 15, 1; 139--154
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integrated palaeontological characteristics (ammonites, ostracods, foraminifers, dinocysts) of the Berriasian deposits of central Crimea
Autorzy:
Savelieva, J.
Feodorova, A.
Shurekova, O.
Arkadiev, V.
Powiązania:
https://bibliotekanauki.pl/articles/2061034.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Berriasian
biostratigraphy
ostracods
foraminifers
spores
pollen
dinoflagellates
ammonites
palaeoecology
correlation
central Crimea
biostratygrafia
małżoraczki
otwornice
zarodniki
pyłek
wiciowce
amonity
paleoekologia
Krym centralny
Opis:
The Berriasian deposits of the central Crimea have been studied in order to compose a composite sequence of the stage with detailed palaeontological characterization. The Berriasian includes the Bedenekyrskaya Formation (packstones), Bechku Formation (siltstones, sandstones) and Kuchkinskaya Formation (sponge packstones, clays, siltstones, and coral-algal bioherm framestones). The Jacobi, Occitanica and Boissieri zones were identified based on ammonites found in the sections. A micropalaeontological analysis determined the following: 6 foraminiferal assemblages, the Costacythere khiamii – Hechticythere belbekensis and Costacythere drushchitzi – Reticythere marfenini ostracod assemblages, and a Phoberocysta neocomica dinocyst assemblage. Palaeoecological analysis of the ostracod and foraminiferal associations indicates a moderately warm marine basin with normal salinity and shallow depths (tens of meters). Only the sponge horizon was probably deposited in a deeper-water environment.
Źródło:
Volumina Jurassica; 2014, 12, 1; 129--162
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detailed biostratigraphy of the Middle Callovian – lowest Oxfordian in the Mikhaylov reference section (Ryazan region, European part of Russia) by ammonites
Autorzy:
Kiselev, D. N.
Rogov, M. A.
Powiązania:
https://bibliotekanauki.pl/articles/2060963.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Callovian
Oxfordian
European Russia
infrazonal scale
reference section
ammonites
palaeobiogeography
Kelowej
Oksford
Rosja europejska
skala infograficzna
punkt odniesienia
amonity
paleobiogeografia
Opis:
Study of the sections near the Mikhaylov (Ryazan region) has made it possible to improve the infrazonal subdivision of the Middle Callovian – Lower Oxfordian of the European Russia by ammonites. The Athleta Zone is the most complete in the studied sections. A sequence of kosmoceratid biohorizons (phaeinum, proniae, rowlstonense and kuklikum) is established here, as well as infrazonal units based on a phylogenetic sequence of species of the genus Funiferites. A study of the paleobiodiversity and frequency of occurrence of ammonites at different intervals of the section showed that the ammonite assemblages of the Athleta Zone are Sub-Boreal or Sub-Tethyan, while in the Lamberti Zone they are Boreal, and in the Lower Oxfordian they are Arctic. It is also shown that the change in ammonite composition in the sections coincides with the cycles of transgressions and regressions of Boreal basins. New species and subspecies of the ammonites Funiferites allae compressum, Cadoceras (Eichwaldiceras) intermedium, Brightia (B.) lominadzei, B. (B.) progzhellensis, B. (B.) eccentrtica, B. (Glyptia) canaliculata stankevitchae, Zieteniceras rarecostatum are described.
Źródło:
Volumina Jurassica; 2018, 16, 1; 73--186
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonites and ammonite stratigraphy of the Bimammatum Zone and lowermost Pianula Zone (Submediterranean Upper Oxfordian) at Bobrowniki and Raciszyn in the Wieluń Upland, central Poland
Autorzy:
Wierzbowski, A.
Głowniak, E.
Pietras, K.
Powiązania:
https://bibliotekanauki.pl/articles/2061382.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
taxonomy
phylogeny
stratigraphy
Submediterranean zonalion
Subboreal/Boreal zonations
stratigraphical correlation
Upper Oxfordian
Lower Kimmeridgian
Opis:
An extensive collection of ammonites made bed by bed from sections in the Submediterranean Upper Oxfordian of the Wieluń Upland, Central Poland, is described and used as a basis for a chronostratigraphical interpretation of the deposits. The ammonites are mostly of Submediterranean character and enable the recognition of the Bimammatum Zone, including the Bimammatum and Hauffianum subzones, as well as the lowermost Planula Zone distinguished here as a new biostratigraphical horizon – the matyjai horizon – based on the occurrence of Subnebrodites matyjai Wierzbowski et Głowniak sp. nov. The Submediterranean ammonites are mostly oppeliids with Taramelliceras (Taramelliceras) [M] – Glochiceras (Lingulaticeras) [m] the most numerous, as well as Taramelliceras (Richeiceras) and Taramelliceras (Metahaploceras) [M] – Glochiceras (Coryceras) [m]. The profusion of ammonites of these two groups in the stratigraphical interval studied provides new information on their evolution, and two new oppeliid species, Taramelliceras (Taramelliceras) zelcense Wierzbowski et Głowniak sp. nov. and Glochiceras (Lingulaticeras) bobrownikiense Wierzbowski et Głowniak sp. nov., are described here. Subboreal and Boreal ammonites are not common in these sections, but are nevertheless important for correlation. Subboreal ammonites of the family Aulacostephanidae are represented by the genus Vineta [M], including its newly recognized microconchiate counterpart, Vineta [m], and a newly established genus Vielunia [M] Wierzbowski et Głowniak gen. nov., with type species Vielunia dzalosinensis Wierzbowski et Głowniak sp. nov. The latter genus includes ammonites previously referred in the area of study to Ringsteadia, and with a microconchiate counterpart assigned to Prorasenia [m]. The Boreal ammonites comprise late cardioceratids assigned to Amoeboceras (Plasmatites). These ammonites indicate that the deposits in question from the Submediterranean Bimammatum Zone up to the Planula Zone correlate with the Subboreal and Boreal lowermost Kimmeridgian (Baylei Zone, and Bauhini Zone, respectively).
Źródło:
Volumina Jurassica; 2010, 8, 1; 49-102
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lower Jurassic to lower Middle Jurassic succession at Kopy Sołtysie and Płaczliwa Skała in the eastern Tatra Mts (Western Carpathians) of Poland and Slovakia: stratigraphy, facies and ammonites
Autorzy:
Iwańczuk, J.
Iwanow, A.
Wierzbowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2061015.pdf
Data publikacji:
2013
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stratigraphy
Middle Jurassic
ammonites
microfacies
correlation
Tatra Mts.
Western Carpathians
stratygrafia
jura środkowa
amonity
mikrofacja
korelacja
Tatry
Karpaty Zachodnie
Opis:
The Lower Jurassic and the lower part of the Middle Jurassic deposits corresponding to the Sołtysia Marlstone Formation of the Lower Subtatric (Krížna) nappe in the Kopy Sołtysie mountain range of the High Tatra Mts and the Płaczliwa Skała (= Ždziarska Vidla) mountain of the Belianske Tatra Mts in the eastern part of the Tatra Mts in Poland and Slovakia are described. The work concentrates both on their lithological and facies development as well as their ammonite faunal content and their chronostratigraphy. These are basinal deposits which show the dominant facies of the fleckenkalk-fleckenmergel type and reveal the succession of several palaeontological microfacies types from the spiculite microfacies (Sinemurian–Lower Pliensbachian, but locally also in the Bajocian), up to the radiolarian microfacies (Upper Pliensbachian and Toarcian, Bajocian–Bathonian), and locally the Bositra (filament) microfacies (Bajocian–Bathonian). In addition, there appear intercalations of detrital deposits – both bioclastic limestones and breccias – formed by downslope transport from elevated areas (junction of the Sinemurian and Pliensbachian, Upper Toarcian, and Bajocian). The uppermost Toarcian – lowermost Bajocian interval is represented by marly-shaly deposits with a marked admixture of siliciclastic material. The deposits are correlated with the coeval deposits of the Lower Subtatric nappe of the western part of the Tatra Mts (the Bobrowiec unit), as well as with the autochthonous-parachthonous Hightatric units, but also with those of the Czorsztyn and Niedzica successions of the Pieniny Klippen Belt, in Poland. The character of the deposits in the sequences, and their biostratigraphical analysis, show that sedimentation during the Early Jurassic, and up to the Late Bajocian, was controlled by rifting phases which were active at the junction of the Sinemurian and Pliensbachian (Zliechov Phase), during the Late Pliensbachian and Toarcian (Devín Phase), and during the Bajocian (Krasín Phase). The onset of pelagic sedimentation overlying the rift strata took place during the latest Bajocian. Selected ammonite taxa are illustrated and discussed.
Źródło:
Volumina Jurassica; 2013, 11, 1; 19--58
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Taxonomical revision of the perisphinctid ammonites of the Upper Jurassic (Plicatilis to Planula zones) described by Józef Siemiradzki (1891) from the Kraków Upland
Autorzy:
Głowniak, E.
Wierzbowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2061324.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
górna jura
Wyżyna Krakowska
Siemiradzki Józef
Polska Akademia Umiejętności
Komisja Fizjograficzna
perisphinctid ammonites
Upper Jurassic
Kraków Upland
Polish Academy of Arts and Sciences
Physiographic Commission
Opis:
This systematic account contains descriptions of ammonite species of the superfamily Perisphinctoidea from the collection of the Physiographic Commission of the 19th century Academy of Arts and Sciences in Kraków. The emphasis is on the description of 11 species introduced by Siemiradzki (1891), e.g. Subdiscosphinctes kreutzi, S. mindowe, S. jelskii, S. dunikowskii, S. ? cracoviensis, S. ? dybowskii, Perisphinctes (Perisphinctes) vajdelota, Perisphinctes (Dichotomosphinctes) crotalinus, P. (Dichotomoceras) alpinus, and Perisphinctes damesi recognised to be nomen dubium, as well as a single species from the Bimammatum Zone – Ringsteadia teisseyrei. Most of the species mentioned are re-described and illustrated for the first time in this paper. In addition, the descriptions of 18 nominal species as well as another 32 species left in open nomenclature, are provided. The species are assigned to 8 genera (Subdiscosphinctes, Perisphinctes, Neumannia, Passendorferia, Idoceras, Orthosphinctes and Ringsteadia) in 3 families (Perisphinctidae, Ataxioceratidae and Aulacostephanidae). In the family Perisphinctidae two new informal species groups have been distinguished: Perisphinctes (Dichotomosphinctes) elisabethae group and the Subdiscosphinctes ? dybowskii group. The Subdiscosphinctes ? cracoviensis group as distinguished by Brochwicz-Lewi�ski, has been re-described and some new forms included in it. The species indicate the Plicatilis and Transversarium zones of the Middle Oxfordian, and the Bifurcatus, Bimammatum and Planula zones hitherto as a whole assigned to the Submediterranean Upper Oxfordian, but in fact correlating with the Upper Oxfordian (Bifurcatus Zone and the lower part of the Bimammatum Zone) and the lowermost Kimmeridgian (upper part of the Bimammatum Zone and Planula Zone) of the Subboreal primary standard for the Oxfordian/Kimmeridgian boundary. The erroneous opinion presented by Siemiradzki (1891) concerning the alleged discordant occurrence of Kimmeridgian deposits of the so called Oppelia tenuilobata Zone in the area studied has been corrected and explained. The paper is provided with some useful species inexes.
Źródło:
Volumina Jurassica; 2007, 5, 1; 27-147
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dańskie amonity - obecny stan wiedzy i perspektywy badań
Danian ammonites - The present state of knowledge and perspectives for future research
Autorzy:
Machalski, M.
Jagt, J.W.M.
Heinberg, C.
Landman, N.H.
Hakansson, E.
Powiązania:
https://bibliotekanauki.pl/articles/2074714.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
masa wymarła
amonity
odsłonięcia K-Pg
relikt
odrodzenie
uderzenie
anomalia irydowa
Maastricht
Dania
Holandia
New Jersey
ammonites
K-Pg boundary
mass extinctions
survival
recovery
impact
iridium anomaly
Danian
Denmark
Opis:
To date, the strongest arguments for ammonite survival into the Danian (earliest Paleogene) are based on material from the lower Danian Cerithium Limestone at Stevns Klint (Denmark), where ammonites occur above a clay layer with impact products at its base, the latter defining the Cretaceous-Paleogene (K-Pg) boundary. The best-preserved specimen is filled with Danian sediment rather than with Maastrichtian chalk, which would be expected had this been reworked material. Arguments for ammonite survival into the Danian have also been provided by specimens from the sporomorph and calcareous nannoplankton-dated lowermost Danian strata of Meerssen Member unit IVf-7, the Netherlands. Their good preservation indicates that they were not subject to any significant transport or redeposition. However, there are no unequivocal impact-related signatures in unit IVf-7, except for rare shocked quartz grains, recorded from burrows at its base. Sections in the Manasquan Basin, New Jersey, USA, provide equivocal data as far as the problem of ammonite survival into the Danian is concerned. At the top of the Tinton Formation there is a Pinna layer replete with fossils, inclusive of ammonites. Their exquisite preservation and occurrence in monospecific clusters rule out redeposition. The Pinna layer contains exclusively late Maastrichtian microfossils. However, a clear iridium anomaly has been noted at its base. Either the New Jersey ammonites survived the K-Pg event for a short time or the iridium is not in situ due to post-depositional repositioning by percolating water. Planned work is to focus on: 1) a detailed centimetre by centimetre sampling of some Cerithium Limestone basins in Denmark in search of additional ammonite material, 2) palaeontological and taphonomic analysis of ammonites and search for impact signatures in unit IVf-7 in the Netherlands, and 3) geochemical study of the iridium anomaly in New Jersey in order to determine whether its position in respect to the ammonite-bed is original or secondary.
Źródło:
Przegląd Geologiczny; 2009, 57, 6; 486-493
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indirect biostratigraphy in condensed successions: a case history from the Bajocian of Normandy (NW France)
Autorzy:
Pavia, G.
Martire, L.
Powiązania:
https://bibliotekanauki.pl/articles/2061355.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
taphonomy
condensation
biostratigraphy
ammonites
Middle Jurassic
Normandy
Opis:
The fossil assemblages of the Bajocian of Normandy are affected by taphonomic condensation, and the use of these assemblages for biostratigraphy must be carried out with great care because of the taphonomic reworking (reelaboration) of most of them. Nevertheless such beautiful fossils, ammonites in particular, retain their value at least as taxonomic references if their relative stratigraphic position is recognized. Such a goal has been achieved in the Bretteville section, where the "Oolithe Ferrugineuse de Bayeux" Formation (OFB), consisting of 14 beds contained within 170 cm of strata, is exposed. Each bed contains a condensed ammonite assemblage in which the overall chronologic interval represented by fossils is longer than the time of sedimentation of the bed, and no ammonites can be defined as contemporaneous with the enclosing matrix, except for the topmost two beds. The timing of biologic and sedimentary events in this Fe-oolitic succession must thus be established in an indirect way, through a stratigraphy of fossils based on their taphonomically delayed first occurrence. In particular, we can only define the maximum age of each layer, constrained by the youngest recorded fossil. On the basis of this approach, the lower part of the OFB is shown to fall within the middle to upper part of the Bajocian Stage (Humphriesianum to Parkinsoni chrons), whereas the uppermost OFB can be referred to as the uppermost Bajocian (latest Parkinsoni Chron). We conclude that, at Bretteville and in general for the Fe-oolites of Normandy, fossiliferous horizons with condensed assemblages have no value for definition of the biostratigraphic standard scale, and that indirect biostratigraphy is useful to assign minimal chronologic values to taxa when (1) their stratigraphical range has not yet been established in expanded successions, (2) they are new taxa, and (3) they are present only in a condensed succession that suffered from the same taphonomic constraints as the Bajocian of Normandy.
Źródło:
Volumina Jurassica; 2009, 7, 1; 67-76
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
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