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Wyszukujesz frazę "belemnite" wg kryterium: Temat


Wyświetlanie 1-7 z 7
Tytuł:
Extremely rare Turonian belemnites from the Bohemian Cretaceous Basin and their palaeogeographical importance
Autorzy:
Kostak, M.
Wiese, F.
Powiązania:
https://bibliotekanauki.pl/articles/21051.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
rare belemnite
belemnite
Turonian
Turonian belemnite
Bohemia
Cretaceous
paleogeography
geological setting
paleontology
systematics
Praeactinocamax bohemicus
Praeactinocamax strehlensis
Opis:
New records of extremely rare late Turonian belemnites are described from the Úpohlavy working quarry in the Bohemian Cretaceous Basin. These specimens are referred to Praeactinocamax bohemicus (Stolley, 1916). An alveolar fragment possibly represents Praeactinocamax strehlensis (Fritsch, 1872) and would be the third find of this species ever recorded. All finds derive from a thin horizon in the uppermost part of the Hudcov limestone (Teplice Formation, uppermost Subprionocyclus neptuni Ammonite Zone). The small faunule most likely had its origin in a taxon from the Praeactinocamax manitobensis/walkeri/sternbergi group of the North American Province, and its occurrence in Europe can be seen in the context of a southward shift of Boreal taxa in the course of a late Turonian cooling event.
Źródło:
Acta Palaeontologica Polonica; 2011, 56, 2
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lower Turonian record of belemnite Praeactinocamax from NW Siberia and its palaeogeographic significance
Autorzy:
Kostak, M.
Wiese, F.
Powiązania:
https://bibliotekanauki.pl/articles/21284.pdf
Data publikacji:
2008
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Lower Turonian
belemnite
Praeactinocamax
Siberia
paleogeography
Belemnitellidae
Turonian
Upper Cretaceous
Russia
Opis:
Specimens of the belemnitellid Praeactinocamax Naidin, 1964 are described from the Upper Cretaceous of NW Siberia (Taimyr Region, Lower Agapa River, Russia). The rostra determined as Praeactinocamax aff. plenus consist of an aragonitic anterior part and a calcitic posterior part with a sharp boundary in between. This boundary surface is referred to as the “alveolar fracture”, and it is a typical morphological feature of early belemnitellids and not a result of diagenetic processes. The occurrence of Praeactinocamax in Arctic areas shows a wider palaeobiogeographical distribution of the genus in the Late Cenomanian–Early Turonian interval than previously known. This finding suggests that migration of the late Cenomanian–early Turonian fauna occurred across Turgai channel. The geographic position of these new records may also explain the occurrence of Praeactinocamax in the Turonian of the US Western Interior Seaway, the origin of which has been hitherto unclear.
Źródło:
Acta Palaeontologica Polonica; 2008, 53, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Halina Pugaczewska [1921-1997]
Autorzy:
Kulicki, C.
Powiązania:
https://bibliotekanauki.pl/articles/21589.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Belemnitida
fauna
biography
paleobiology
geology
Jurassic belemnite
Pugaczewska Halina biography
paleontology
Źródło:
Acta Palaeontologica Polonica; 1997, 42, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fusiteuthis polonica, a rare and unusual belemnite from the Maastrichtian
Autorzy:
Christensen, W K
Powiązania:
https://bibliotekanauki.pl/articles/21101.pdf
Data publikacji:
2002
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
belemnitellid
belemnite
Polska
Fusiteuthis polonica
Belemnitellidae
Germany
Crimea
new genus
Maastrichtian
taxonomy
new species
paleontology
Belemnella lanceolata
Fusiteuthis
Opis:
A specimen of Fusiteuthis polonica, from the basal Maastrichtian of the “Saturn” chalk pit at Kronsmoor in northwest Germany, is described. It came from the uppermost part of the Belemnella lanceolata Zone, ca. 9.5 m above the base of the Maastrichtian as defined on belemnites. Fusiteuthis was very rare, but widely distributed. Single occurrences are known from northwest Germany, Poland and Crimea. It has been recorded only from the lowest and uppermost parts of the Maastrichtian; the longevity of this genus was thus slightly less than 6 myr. Fusiteuthis belongs to the Upper Cretaceous belemnite family Belemnitellidae.
Źródło:
Acta Palaeontologica Polonica; 2002, 47, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cephalopods (Mollusca: Cephalopoda) in the palaeontological collection of the Faculty of Biology, Adam Mickiewicz University
Autorzy:
Konwerski, S.
Bloszyk, J.
Powiązania:
https://bibliotekanauki.pl/articles/84387.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
cephalopod
Mollusca
Cephalopoda
paleontological collection
Faculty of Biology
Adam Mickiewicz University
Poznan city
Baculites
belemnite
ammonite
shell
fossil
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aragonitic rostra of the Turonian belemnitid Goniacamax: arguments from diagenesis
Autorzy:
Dauphin, Y
Williams, C.T.
Barskov, I.S.
Powiązania:
https://bibliotekanauki.pl/articles/20211.pdf
Data publikacji:
2007
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Turonian
sea shell
Cephalopoda
belemnite
calcite
Goniocamax
rostrum
skeleton
sea cephalopod
diagenesis
paleoenvironment
freshwater shell
Belemnitida
aragonite
Siberia
belemnitid rostrum
Piasina River
paleontology
Opis:
The hypothesis that belemnitid rostra are formed by primary biogenic low−Mg calcite is widespread. However, the coexistence in the same rostrum of both aragonitic and calcitic components has been reported in true belemnites (Goniocamax, Turonian). A combined microstructural and chemical composition study of the comparison of shells with undisputed mineralogy from the same site as the Turonian Goniocamax, shows that these aragonitic shells display the effects of diagenetic alteration. These observations favour the hypothesis that belemnite rostra are composed of primary aragonite, rather than low−Mg calcite, and are consistent with all other cephalopod shells. Calcitic and aragonitic rostra are also known in other Dibranchiata such as Triassic Aulacocerida and Eocene Belopterina. Diagenetic changes such as shown here may clearly affect palaeo−environmental interpretations based on carbonate shells.
Źródło:
Acta Palaeontologica Polonica; 2007, 52, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
    Wyświetlanie 1-7 z 7

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