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On the Diversity of Microfossils in the Bazhenov Horizon of Western Siberia (Late Jurassic–Early Cretaceous)

E.O. Amon, V.S. Vishnevskaya, Yu.A. Gatovsky, E.A. Zhegallo

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Paleontological remains from the Bazhenovo Horizon of Western Siberia (Tithonian–Berriasian) are represented by macro- and microfossils. The Horizon had a marine genesis and the basis of ecosystem of this paleobasin composed of pelagic organisms-producers (phytoplankton: prasinophytes, coccolithophorids, dinoflagellates, as well as brown algae) and consumers (zooplankton: radiolarians, invertebrate larvae, crustaceans; and nekton: pelagic bony fish, ammonites, belemnites, paleosquids-teutids and marine dinosaurs; and, in addition, benthic bivalves, foraminifera, and ostracods). Among microfossils, radiolarians are the leading importance, phytoplankton (dinoflagellates, coccolithophorids) and microbenthos (foraminifera, sponge spicules) are less common. Radiolarians, dinoflagellates, coccolithophorids, and foraminifera are used for biostratigraphic subdividing of sections and their correlation, and, in addition, together with sponge spicules, for reconstruction the paleoenvironments. In literature, a several paper indicated the presence of other siliceous microfossils in paleobiota of the Bazhenovo paleosea – diatoms, silicoflagellates, and acantharians. The article summarized data on radiolaria, coccolithophorids, dinophyta and critically reviewed reports of other microobjects. It is shown that the information about diatoms, silicoflagellates and acantharians from Bazhenovo Horizon and Bazhenovo Formation is probably unreliable.
Radiolaria, coccolithophorids, dinoflagellates, Bazhenovo Horizon, Western Siberia, Late Jurassic, Tithonian, Early Cretaceous, Berriasian
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Edward O. Amon
Borissiak Paleontological Institute of the Russian Academy of Sciences
Profsoyuznaya st. 123, Moscow, 117997, Russian Federation

Valentina S. Vishnevskaya
Geological Institute of the Russian Academy of Sciences
Pyzhevsky lane 7, bld. 1, Moscow 119017, Russian Federation

Yury A. Gatovsky
Lomonosov Moscow State University
Leninskie gory, 1, Moscow 119234, Russian Federation

Elena A. Zhegallo
Borissiak Paleontological Institute of the Russian Academy of Sciences
Profsoyuznaya st. 123, Moscow 117647, Russian Federation


For citation:

Amon E.O., Vishnevskaya V.S., Gatovsky Y.A., Zhegallo E.A. (2021). On the Diversity of Microfossils in the Bazhenov Horizon of Western Siberia (Late Jurassic–Early Cretaceous). Georesursy = Georesources, 23(3), pp. 118–131. DOI: