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Tytuł:
A new species of Pseudhimalayites (Ammonitina, Aspidoceratoidea) from the Lower Tithonian of the Betic Range, Southern Spain
Autorzy:
Parent, Horacio
Ramos-Agustino, Enrique
Scherzinger, Armin
Schweigert, Günter
Powiązania:
https://bibliotekanauki.pl/articles/28826138.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Pseudhimalayites carchelejensis n.sp.
Aspidoceratoidea
Aspidoceratidae
Tithonian
Ponti Zone
Betic Range
Tytonian
strefa Ponti
strefa Betic
Opis:
The Late Jurassic aspidoceratoid genus Pseudhimalayites Spath is scarcely recorded but widely distributed in the Andean basins, the Caribbean region, and in the European Tethys. From Ponti Zone (Lower Tithonian) rocks of the Betic Range in Carchelejo we describe here the new species Pseudhimalayites carchelejensis, based on a macroconch (female) holotype. The corresponding microconch (male), described from the same ammonite assemblage, would belong to the morphogenus Simocosmoceras Spath which groups the microconchs of Pseudhimalayites. P. carchelejensis n. sp. differs from the coeval Pseudhimalayites steinmanni (Haupt) by lacking ventral tubercles in the phragmocone and by bearing umbilical tubercles only from the adult whorl of the phragmocone. These differences illustrate a significant morphologic divergence between the Andean and the Tethyan lineages.
Źródło:
Volumina Jurassica; 2023, 21; 19--26
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corbinites (Subfamily Lithacoceratinae), a new genus for the giant western Canadian Late Kimmeridgian or Tithonian (Late Jurassic) ammonite Titanites occidentalis Frebold
Autorzy:
Poulton, Terence P.
Powiązania:
https://bibliotekanauki.pl/articles/28826147.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonite
Kimmeridgian-Tithonian
Corbinites
Lithacoceratinae
ataxioceratoid-ribbing
Canada
amonit
Kimerydgian-Tyton
Korbinity
żebra ataksjoceratoidowe
Kanada
Opis:
The finding of two new specimens and a reappraisal of the single original specimen of the problematic giant Canadian Late Ju- rassic ammonite Titanites occidentalis Frebold results in the creation of Corbinites, n. gen. It is assigned to the ataxioceratid subfamily Lithacoceratinae largely because of the presence of variocostate and previously unrecognized ataxioceratoid ribbing in middle and late growth stages. With enigmatic ancestry and geographically removed other forms with similar characteristics, the species may have been endemic in the relatively isolated early Alberta foreland basin of western interior Canada.
Źródło:
Volumina Jurassica; 2023, 21; 27--38
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and chronology of the Late Jurassic shallow-water carbonate deposits of the Holy Cross Mountains area, central Poland
Autorzy:
Wierzbowski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/28883744.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
history of sedimentation
cyclicity
climatic factors
tectonic factors
ammonite stratigraphy
Late Oxfordian
Kimmeridgian
Early Tithonian
historia sedymentacji
cykliczność
czynniki klimatyczne
czynniki tektoniczne
stratygrafia amonitów
późny oksford
wczesny tyton
Opis:
The Late Jurassic shallow-water carbonates with intervening clayey-marly deeper-water deposits in the Holy Cross Mts. area formed over large bank of the elevated part of the Northern Tethyan Shelf during about 12 myr. They comprise three main successions (I, II and III) deposited partly in different environmental conditions, controlled by tectonic and climatic factors, and still preserved in the  north-eastern margin, the north-western margin and the south-western margin of the Holy Cross Mountains. The history of sedimentation is presented according to the concept of the large tectono-stratigraphic units COK, LUK and KVB, which owe their origin to variable rates of tectonic subsidence, as introduced by Kutek (1994) for the area of central Poland. The studied deposits of the COK megasequence cor- responding to the Upper Oxfordian and the Lower Kimmeridgian up to the Hypselocyclum Zone consist of coral limestones, various grained (including oolitic) limestones, and micritic limestones formed over the gradually enlarging shallow-water carbonate platform of the Holy Cross Mts. This platform was subsequently subdivided into two elevated areas, separated by a depressed zone in the middle, bounded by the Nowe Miasto–Iłża–Bałtów Fault Zone in the north-east and the Holy Cross Fault System in the south. The younger mega- sequence LUK with it strongly transgressive character marks the successive stages of the marine transgression which entered the central, lowered part of the area of the Holy Cross Mts. from the west, where it appeared already in the early Hypselocyclum Chron. It succes- sively spread across the Holy Cross Mts. area towards the north-east and south bringing everywhere the deposition of various oyster lu- machelles and marls with ammonites at the end of the Hypselocyclum Chron and during the Divisum Chron of the Early Kimmeridgian to the Acanthicum/Mutabilis Chron of the earliest Late Kimmeridgian. The following megasequence KVB is represented by the detrital lu- machelles and chalky limestones with nereineids of the Eudoxus Chron of the Late Kimmeridgian marking the development of still younger shallow-water carbonate platform in the uplifted areas in the north-eastern and possibly the south-western margins of the moun- tains, allegedly subdivided by a deeper area of sedimentation of marly deposits. The youngest Late Jurassic deposits of the Holy Cross Mts., are very fragmentarily preserved, mostly because of Early Cretaceous uplift and erosion. They suggest an initial episode of complete drowning of the carbonate platform which became covered by marly deposits during the Early Tithonian, and the subsequent restoration of shallow-water carbonate sedimentation at the end of the Early Tithonian.
Źródło:
Volumina Jurassica; 2023, 21; 39--82
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Revised holostratigraphy of the Tithonian-Berriasian transition at Tré Maroua (Le Saix, Hautes-Alpes, SE France): study of a rejected Berriasian GSSP candidate
Autorzy:
Granier, Bruno R.C.
Benzaggagh, Mohamed
Ferry, Serge
Powiązania:
https://bibliotekanauki.pl/articles/27324248.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
stratigraphy
calpionellids
saccocomids
Tithonian
Berriasian
lithoclasts
erosion
debris flows
turbidites
Vocontian Trough
stratygrafia
kalpionellidy
sakokomidy
Tytonian
Berriazjatycki
litoklasty
erozja
spływają śmieci
turbidyty
Rynna Wokoncka
Opis:
The study of the Tithonian and lower Berriasian succession of Le Saix (Hautes-Alpes, France) has made it possible to better characterize the lithological succession at a former Berriasian GSSP candidate, its set of microfacies, the stratigraphic ranges of the main groups of marine plankton and therefore the calpionellid and saccocomid biozonations. On the lithological level, the Tithonian strata are characterized by thick-bedded breccias representing debris flows and related calciturbidites, whereas the Berriasian strata are typically white limestones. The lower part of the Berriasian is comprised of scattered intercalations of thin-bedded breccias and calciturbitides (including cryptic mud calciturbidites). In thin sections, the white limestones display mud- to wackestone textures and their allochems are mostly tiny bioclasts (e.g., radiolarians, calpionellids, saccocomids). Calciturbidites have wacke- to grainstone textures and their allochems are mostly pseudointraclasts and extraclasts, comprising various bioclasts and some ooids. Mud turbidites are made of micrograin-stones some yielding almost exclusively well-sorted calpionellids, which were previously erroneously interpreted as the signature of “explosions” or “blooms” of Calpionella alpina. Breccias are mostly lithoclastic floatstones with a matrix similar to that of the calciturbid- ites. Their lithoclasts are either extraclasts sensu stricto, i.e., material derived from updip shallow-water areas, or pseudointraclasts representing reworked subautochthonous material, i.e., mud- and wackestone lithoclasts with radiolarians, saccocomids and/or calpionellids. Radiolarians are common over the whole studied interval. Saccocomids are part of the dominating biota reported from the lower and lower upper Tithonian interval whereas calpionellids replace them in the uppermost Tithonian to lower Berriasian interval. Minor plank- tonic groups comprise calcareous dinoflagellates and Globochaete alpina; Iranopsis nov. group is also present. Intervals with saccocomid sections characteristic of zones 4-5 and zone 6 are respectively ascribed here to the lower Tithonian (4-5) and the lower upper Tithonian (6). The biozonation of the calpionellid group sensu lato allows identification of i) the Boneti Subzone of the chitinoidellids, ii) the Cras- sicollaria Zone, more specifically its Tintinnopsella-Intermedia (A1), Intermedia-Alpina (A2) and Brevis-Massutiniana (A3) subzones, and iii) the Alpina Zone, with its Alpina-Parvula (B1) and its Alpina-Remaniella (B2) subzones. On the basis of biostratigraphical and sedimentological data, most zonal boundaries prove to be hiatal, located at the erosional base of breccia or turbidite layers whereas the Tithonian/Berriasian stage boundary appears to be located at a strike-slip fault plane in the Tré Maroua section.
Źródło:
Volumina Jurassica; 2023, 21; 1--18
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Summary of a decade of research at the Owadów–Brzezinki Lagerstätte (Tithonian, central Poland): A review and perspectives for the future
Autorzy:
Błażejowski, Błażej
Weryński, Łukasz
Wierzbowski, Andrzej
Michalska, Monika
Hryniewicz, Krzysztof
Uchman, Alfred
Kugler, Stanisław
Bącal, Paweł
Hołda-Michalska, Aleksandra
Powiązania:
https://bibliotekanauki.pl/articles/28883741.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Late Jurassic
Tithonian
marine fossils
terrestrial fossils
palaeobiogeography
palaeontology
późna jura
Tytonian
skamieniałości morskie
skamieliny ziemskie
paleobiogeografia
paleontologia
Opis:
For over ten years, the Lower to Upper Tithonian boundary beds cropping out in the Owadów–Brzezinki quarry have yielded numerous fossils of ammonites, bivalves, brachiopods, xiphosurans, decapods, insects, and vertebrates – including actinopterygian fishes and various reptiles and others, all of which exhibit fine preservation of their anatomical details due to special environmental conditions during their fossilization. The Owadów–Brzezinki section is also important for stratigraphical correlations because it contains ammonite faunas indicative of the NE European and NW European Subboreal zonal schemes, as well as Tethyan calpionellids. The whole faunal as- semblage, which represents taxa of many iconic groups of Mesozoic animals, has created the opportunity to establish the ‘Owadów– Brzezinki geopark’, a geoeducation area where the public, and especially the young, can learn about the beauty of the natural history of the region.
Źródło:
Volumina Jurassica; 2023, 21; 83--98
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Further observations on the bio- and magnetostratigraphy of the J/K boundary interval in southern Ukraine
Autorzy:
Wimbledon, William A.P.
Svobodova, Andrea
Bakhmutov, Vladimir
Poliachenko, Ievgen
Hlavatskyi, Dmytro
Powiązania:
https://bibliotekanauki.pl/articles/2127369.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
J/K boundary
Tithonian
Berriasian calcareous nannofossils
magnetostratigraphy
Opis:
This is an account of finds of stratigraphically useful calcareous nannofossils and the magnetostratigraphy of the Jurassic-Cretaceous boundary interval of the eastern Crimean peninsula (southern Ukraine). We compare these new complementary results with those presented by our team in earlier publications. A missing interval in the Crimean sequence is filled, and the position of the Tithonian-Berriasian (J/K) boundary is confirmed.
Źródło:
Geological Quarterly; 2022, 66, 1; art. no. 11
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tracking Late Jurassic ornithopods in the Lusitanian Basin of Portugal: Ichnotaxonomic implications
Autorzy:
Castanera, D.
Silva, B.C.
Santos, V.F.
Malafaia, E.
Belvedere, M.
Powiązania:
https://bibliotekanauki.pl/articles/2082160.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Iguanodontipodidae
Dinehichnus
Anomoepus-like
Kimmeridgian
Tithonian
Europe
Opis:
The Sociedade de História Natural in Torres Vedras, Portugal houses an extensive collection of as yet undescribed dinosaur tracks with ornithopod affinities. They have been collected from different Late Jurassic (Kimmeridgian–Tithonian) geological formations (Praia de Amoreira-Porto Novo, Alcobaça, Sobral, and Freixial) that outcrop along the Portuguese coast, and belong to two different sub-basins of the Lusitanian Basin (the Consolação and Turcifal sub-basins). Three main morphotypes can be distinguished on the basis of size, mesaxony and the morphology of the metatarsophalangeal pad impression. The minute to small-sized morphotype is similar to the Anomoepus-like tracks identified in other Late Jurassic areas. The small to medium-sized morphotype resembles the Late Jurassic–Early Cretaceous ichnotaxon Dinehichnus, already known in the Lusitanian Basin. Interestingly, these two morphotypes can be distinguished qualitatively (slightly different size, metatarsophalangeal pad impression and digit morphology) but are nevertheless difficult to discriminate by quantitatively analysing their length-width ratio and mesaxony. The third morphotype is considered a large ornithopod footprint belonging to the ichnofamily Iguanodontipodidae. This ichnofamily is typical for Cretaceous tracksites but the new material suggests that it might also be present in the Late Jurassic. The three morphotypes show a negative correlation between size and mesaxony, so the smaller tracks show the stronger mesaxony, and the larger ones weaker mesaxony. The Upper Jurassic ornithopod record from the Lusitanian Basin has yielded both small and medium-sized ornithopod remains, mainly iguanodontians such as dryosaurids and ankylopollexians, which are the main candidates to be the trackmakers.
Źródło:
Acta Palaeontologica Polonica; 2020, 65, 2; 399-412
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonite stratigraphy and organic matter of the Pałuki Fm.n(Upper Kimmeridgian–Lower Tithonian) from the central-eastern part of the Łódź Synclinorium (Central Poland)
Autorzy:
Wierzbowski, Andrzej
Wierzbowski, Hubert
Powiązania:
https://bibliotekanauki.pl/articles/2060945.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
Upper Kimmeridgian
Lower Tithonian
organic matter distribution and maturity
hydrocarbon generation
amonity
górny kimeryd
dolny tyton
rozmieszczenie i dojrzałość materii organicznej
wytwarzanie węglowodorów
Opis:
The ammonite biostratigraphy as well as the organic matter content, its type and maturity of the Pałuki Formation, belonging to the fine, siliciclastic Kimmeridge Clay type facies, were investigated in five deep boreholes from the central-eastern part of the Łódź Synclinorium in Central Poland. The studied deposits are assigned to the Eudoxus and Autissiodorensis zones of the Upper Kimmeridgian as well as the Klimovi, Sokolovi, Pseudoscythica and Puschi (=Tenuicostata) zones of the Lower Tithonian (“Lower Volgian”). The Pałuki Formation shows in its lower and middle parts average TOC concentrations of ca. 2.5 wt.% and prominent, restricted increases in organic matter content, which are found in the mid-Eudoxus Zone, the lowermost part of the Autisiodorensis Zone, and at the Sokolovi–Pseudoscythica zone boundary. These stratigraphical intervals correlate well with rich in organic matter levels present in the Kimmeridge Clay Formation of NW Europe. The periodic expansions of Submediterranean and Subboreal-Boreal ammonites corresponded mostly to the transgressive phases, often correlated with a higher content of organic matter. The development of special morphologies of ammonites, such as the small-sized, nectopelagic forms of Nannocardioceras in the Late Kimmeridgian, has also been related to the deposition of shales rich in organic matter during the transgression maxima. The organic matter present in the Pałuki Formation mostly consists of Type II kerogen and is immature or early mature with respect to hydrocarbon generation, which is in agreement with previously published data. Evaluation of the new and published geochemical, lithological and structural data from the Pałuki Formation in the central-eastern part of the Łódź Synclinorium shows that these deposits could not have been a considerable source of crude oil or gas.
Źródło:
Volumina Jurassica; 2019, 17, 1; 49--80
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Late Jurassic facies succession of the Kleszczów Graben area (southern border of the Łódź Depression, peri-Tethyan shelf, central Poland)
Autorzy:
Olchowy, Piotr
Krajewski, Marcin
Felisiak, Ireneusz
Powiązania:
https://bibliotekanauki.pl/articles/2058630.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Late Jurassic
outer-inner ramp facies
Oxfordian
Kimmeridgian
Tithonian
North Tethys Shelf
Opis:
Numerous fully cored boreholes completed in the last years in central Poland (Kleszczów Graben area, southern border of the Łódź Depression) enabled the researchers to obtain new sedimentological data on the Oxfordian-Tithonian continuous sedimentary record in the Polish part of the northern Tethys shelf. Twenty-two facies were distinguished in the sedimentological succession. The facies represent the outer-, mid- and inner-ramp environments, including evaporitic episodes and palaeosols. The facies document that the Oxfordian-Lower Kimmeridgian (up to Hypselocyclum) carbonate ramp has evolved to the Upper Kimmeridgian-Tithonian carbonate-siliciclastic ramp. Among the Kimmeridgian deposits, numerous hardgrounds, tidal channel deposits and gravity flow sediments were identified. The Kleszczów Graben sedimentary succession is discussed along with the lithostratigraphical units known from the adjacent regions of southern and central Poland.
Źródło:
Geological Quarterly; 2019, 63, 4; 657--682
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Macroconch ammonites from the Štramberk Limestone deposited in the collections of the Czech Geological Survey (Tithonian, Outer Western Carpathians, Czech Republic)
Autorzy:
Vašíček, Zdeněk
Malek, Ondřej
Powiązania:
https://bibliotekanauki.pl/articles/2060948.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
megaammonites
Tithonian
Silesian Unit
Outer Western Carpathians
megaaminity
tytanian
jednostka śląska
Zewnętrzne Karpaty Zachodnie
Opis:
11 specimens of large sized ammonites from the Štramberk Limestone deposited in the collections in Prague represent 6species. Two species belong to the superfamily Lytoceratoidea, the remaining ones to the superfamily Perisphinctoidea. The perisphinctid specimens belong to the Lower and the Upper Tithonian, and the lytoceratids probably correspond to the same stratigraphic level. Two species, namely Ernstbrunnia blaschkei and Djurjuriceras mediterraneum were not known from the Štramberk Limestone earlier.
Źródło:
Volumina Jurassica; 2019, 17, 1; 81--94
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Tithonian stratigraphy and ammonite fauna of the Vaca Muerta Formation in Mallín Quemado (Neuquén Basin, Argentina), with remarks on the Andean chronostratigraphy
Autorzy:
Garrido, A. C.
Parent, H
Brambilla, L.
Powiązania:
https://bibliotekanauki.pl/articles/2060958.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
Tithonian
Vaca Muerta Formation
chronostratigraphy
Mallín Quemado
ammonite bio-horizons
Neuquen Basin
amonity
tyton
Formacja Vaca Muerta
chronostratygrafia
Opis:
In the Cerro Mallín Quemado area (Sierra de la Vaca Muerta) the three members of the Vaca Muerta Formation (Portada Covunco, Los Catutos and Pichi Moncol) can be recognized, including the whole of the Tithonian rock-record. The ammonite fauna does not show significant differences with respect to that of the nearby locality Pampa Tril, but the record of faunal horizons is patchier. Eighteen species of ammonites were recorded through the studied sections, covering the whole of the Andean Tithonian. The current chronostratigraphic zonation of the Andean Tithonian is briefly discussed, updated and correlated with the most recent literature. From the current succession of ammonite bio-horizons previously defined in the basin, only three (picunleufuense alpha, picunleufuense beta and falculatum) were recognized definitely. Four other bio-horizons (perlaevis, erinoides, internispinosum alpha and vetustum) were recognized only tentatively, because the typical assemblages of morphotypes (morpho-species) were not clearly or completely recognized. The current regional time-correlation chart dated by the ammonite bio-horizons of the Neuquén Basin along a 70°W transect is updated with the results of the present study and additional information recently obtained from other localities
Źródło:
Volumina Jurassica; 2018, 16, 1; 1--26
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Upper Jurassic bacteria from the Raptawicka Turnia Limestone Formation in the Mały Giewont area (Western Tatra Mountains, Poland)
Autorzy:
Pszczółkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/2060080.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
fossil bacteria
micro-oncoids
Kimmeridgian-Tithonian
Tatra Mountains
Opis:
Fossil filamentous and non-filamentous bacteria are reported from the Upper Jurassic limestones of the Raptawicka Turnia Limestone Formation in the Mały Giewont sections of the Western Tatra Mountains (Poland). The filamentous bacteria are subdivided into five groups: thin uniseriate, large multi-cell, large spiral, tapering and branched forms. The thin uniseriate filaments are the main microbial component of the peloids and micro-oncoids from the studied formation, mainly in the Upper Kimmeridgian-Tithonian limestones. The presence of the heterocyte-like terminal cells suggests their interpretation as cyanobacteria similar to the modern order Nostocales and perhaps to the family Nostocaceae. The large multi-cell and tapering filaments are uncommon in the studied limestones. The branched filaments found in the Tithonian limestones, although thinner, probably also may be compared with some modern representatives of the order Nostocales. Non-filamentous fossil bacteria found in the studied limestones consist of rod-shaped bacilli, monotrichous bacilli and spirilla; they belong mainly to the phylum Proteobacteria. Some microborings observed in the microfossils occurring in the micro-oncoids remind the ichnotaxon Scolecia filosa Radtke known to be of wide palaeobathymetric range. The thinnest microborings resemble another group of ichnofossils named “Pygmy form”, probably also of bacterial origin. The Upper Kimmeridgian-Tithonian micro-oncoids were formed mainly by filamentous bacteria (Cyanobacteria) that overgrew successively their nuclei with a few to several laminae. Frequent occurrence of pelagic microfossils as nuclei of micro-oncoids does not match a transport of these coated grains from much shallower sedimentary environments. The fossil filamentous bacteria filling up the peloids and micro-oncoids could be adapted to conditions that existed in the sublittoral zone below the wave base.
Źródło:
Geological Quarterly; 2018, 62, 4; 840--857
1641-7291
Pojawia się w:
Geological Quarterly
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:
The Jurassic-Cretaceous boundary in Boreal Russia : radiolarian and calcareous dinoflagellate potential biomarkers
Autorzy:
Vishnevskaya, V. S.
Powiązania:
https://bibliotekanauki.pl/articles/2060606.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tithonian stages
Berriasian stages
radiolarians
calcareous dinoflagellates
Tethys
boreal
Volgian
Opis:
The International Berriasian Working Group (ISCS) suggested primary and secondary marker “datums” to fix the basal Berriasian boundary and thus to detine the Jurassic-Cretaceous boundary (Wimbledon et al., 2011, 2013). Two primary markers Calpionella, as well as calcareous nannoplankton, are practically unknown in the Boreal Realm. Testing and calibration of these markers, as well as of fossils of radiolarians and other signals, in the most complete sections, were declared as an important task for the near future. In the Tethys, the Jurassic-Cretaceous boundary based on radiolarians falls inside zone UAZ 13 of Baumgartner et al. (1995), whereas in the palaeo-Pacific it corresponds to the boundary between zones 4 and 5 of Pessagno et al. (2009), and in boreal Siberia it probably falls between the biohorizons of Parvicingula haeckeli and P. khabakovi. The radiolarian events at the Jurassic-Cretaceous boundary in the boreal successions of Russia can be proposed to be used as an additional biomarker to help develop new integrated boundary criteria. Thus, as the first appearance of the zonal species Calpionella alpina, which defines the Jurassic and Cretaceous boundary, coincides with the first occurrence of the calcareous dinocyst zonal species Stomiosphaerina proxima (Reháková, 2000), it is logical to propose a calcareous dinoflagellate, widely represented in the Upper Jurassic-Lower Cretaceous Bazhenovo Formation of Siberia, as a secondary marker.
Źródło:
Geological Quarterly; 2017, 61, 3; 641--654
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Xenosphinctes n. gen. (Ataxioceratidae, Lithacoceratinae), a new rare ammonite genus from the Lower Tithonian (Hybonotum Zone) of SW Germany
Autorzy:
Scherzinger, A.
Schweigert, G.
Powiązania:
https://bibliotekanauki.pl/articles/2060975.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ammonites
Early Tithonian
biostratigraphy
Germany
Xenosphinctes berkai
amonity
Wczesny Tyton
biostratygrafia
Niemcy
Opis:
The new monotypic ammonite genus Xenosphinctes (type species: Xenosphinctes berkai n. sp.) is established. It is recorded from the Upper Jurassic, Early Tithonian, Hybonotum Zone, Riedense Subzone, eigeltingense α horizon from the Talmühle, N of Engen, Baden-Württemberg, SW Germany.
Źródło:
Volumina Jurassica; 2017, 15, 1; 155--160
1896-7876
1731-3708
Pojawia się w:
Volumina Jurassica
Dostawca treści:
Biblioteka Nauki
Artykuł
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