Continental Sediments of the Early Cretaceous from Western Siberia. Part 2. Continental Mesozoic Sediments—Stratotype of the Lower Creataceous Ilek Formation (Bolshoi Ilek) at the Chulym River (Achinsk, Krasnoyarsk Region)

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.

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Early cretaceous mammals of Western Siberia: 3. Zhangheotheriidae

Paleontological Journal ◽

10.1134/s0031030110050138 ◽

2010 ◽

Vol 44 (5) ◽

pp. 573-583 ◽

Cited By ~ 17

Author(s):

A. V. Lopatin ◽

A. O. Averianov ◽

E. N. Maschenko ◽

S. V. Leshchinskiy

Keyword(s):

Early Cretaceous ◽

Western Siberia

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Early Cretaceous mammals of Western Siberia: 2. Tegotheriidae

Paleontological Journal ◽

10.1134/s0031030109040157 ◽

2009 ◽

Vol 43 (4) ◽

pp. 453-462 ◽

Cited By ~ 15

Author(s):

A. V. Lopatin ◽

A. O. Averianov ◽

E. N. Maschenko ◽

S. V. Leshchinskiy

Keyword(s):

Early Cretaceous ◽

Western Siberia

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THE FEATURES OF THE GEOLOGICAL STRUCTURE AND SEDIMENTATION OF THE EARLY CRETACEOUS SITE OF THE TERRESTRIAL VERTEBRATES OF SHESTAKOVO (KEMEROVO REGION, RUSSIA)

Proceedings of higher educational establishments Geology and Exploration ◽

10.32454/0016-7762-2018-2-13-23 ◽

2018 ◽

pp. 13-23

Author(s):

A. V. Podlesnov ◽

B. I. Morkovin ◽

E. N. Maschenko

Keyword(s):

Early Cretaceous ◽

Western Siberia ◽

Geological Structure ◽

Point Of View ◽

Faunal Composition ◽

Terrestrial Vertebrates ◽

Coastal Marine ◽

Geological Section ◽

The Given

A new data on the geological structure, conditions of formation and faunal composition of the Early Cretaceous site of the terrestrial vertebrates by Shestakovo village (Kemerovo Region, Western Siberia) has been presented.The consolidated geological section has been constructed along the line Shestakovo-1 — Shestakovo-4 — Shestakovo-3 in which five lithologic members have been identified. A distribution of the vertebrates fauna taxons has been carried out along the selected lithologic members composing the Shestakovo series of the Ilek formation. A new data obtained during fieldwork in 2017 has made it possible to distinguish two main bony levels (lithologic members 3 and 5), which contain whole skeletons of reptiles. Lithofacies analysis has shown that the formation of the sites occurred under the conditions of the fluviolacustrine plain, where the channel, delta and floodplain facies were replaced by lake and lake-marshy facies, forming a series of sedimentation cycles. The latter are the evidence of the increase in the aridization of the climate upwards along the section. The given data calls into question previously expressed point of view about the coastal-marine or lagoon genesis of the Shestakovo series.

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