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Lower Turonian record of belemnite Praeactinocamax from NW Siberia and its palaeogeographic significance

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Kostak M., Wiese F.

Acta Palaeontologica Polonica

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2008

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tom 53

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nr 4

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.

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Extremely rare Turonian belemnites from the Bohemian Cretaceous Basin and their palaeogeographical importance

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Kostak M., Wiese F.

Acta Palaeontologica Polonica

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2011

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tom 56

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nr 2

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.

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First Cenomanian dinosaur from Central Europe [Czech Republic]

71%

Fejfar O., Kostak M., Kvacek J., Mazuch M., Moucka M.

Acta Palaeontologica Polonica

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2005

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tom 50

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nr 2

We describe the first dinosaur skeletal remains found in the Czech Republic, consisting of one complete femur and indeterminable bone fragments. They were recovered from the upper Cenomanian near−shore marine sediments deposited on the slopes of an ancient archipelago, several kilometres north of the larger Rhenish−Bohemian Island that was situated in what is now the middle of Europe. Sediments yielding dinosaur remains are of late Cenomanian age, Inoceramus pictus–I. pictus bohemicusinoceramid zone of the local lithostratigraphic unit, the Peruc−Korycany Formation. These are the first uncontested dinosaurian fossils reported from this formation and also the first Cenomanian dinosaur record in Central Europe. They document a small ornithopod belonging to an iguanodontid species comparable with similar Late Cretaceous European forms. The herbivorous dinosaur lived among a vegetation transitional between salt marsh flora, with abundant halophytic conifer Frenelopsis alata; and an alluvial plain assemblage dominated by lauroid angiosperms.

Ograniczanie wyników

3 Acta Palaeontologica Polonica

3 Kostak M.

2 Wiese F.

1 Fejfar O.

1 Kvacek J.

1 Mazuch M.

1 Moucka M.

1 2011

1 2008

1 2005

Lower Turonian record of belemnite Praeactinocamax from NW Siberia and its palaeogeographic significance

Extremely rare Turonian belemnites from the Bohemian Cretaceous Basin and their palaeogeographical importance

First Cenomanian dinosaur from Central Europe [Czech Republic]