Change of micropaleontological assemblages at the Cretaceous-Paleogene Boundary in Western Siberia

V.M. Podobina; V.M. Kabanova; T.G. Kseneva

doi:10.54991/jop.1997.1332

Authors

V.M. Podobina Tomsk State University, 36 Lenin Avenue, Tomsk 634050, Russia
V.M. Kabanova Tomsk State University, 36 Lenin Avenue, Tomsk 634050, Russia
T.G. Kseneva BTomsk State University, 36 Lenin Avenue, Tomsk 634050, Russia

DOI:

https://doi.org/10.54991/jop.1997.1332

Keywords:

Cretaceous-Tertiary Boundary, Foraminiferal zones, Palynocomplex, Maastrichtian, Danian, Russia, Siberia

Abstract

The foraminiferal and spore-pollen complexes were studied at the boundary of Maastrichtian-Danian (CretaceousPalaeogene) in Western Siberia. Terrigenic-argillaceous rocks with admixture of carbonaceous material from the upper part of Gankinsky Suite and lower layers of Talitsky Suite belong to this stratigraphical interval. Carbonaceous secreted and secreted agglutinated shells predominate among benthic Foraminifers. Planktonic forms were seldom and consist of representatives of the genera - Rugoglobigerina and Guembelina in the Maastrichtian and genera Globigerina and (rarely) Globorotalia in the Danian. At the Cretaceous-Palaeogene Boundary, palynocomplexes consist of group of angiosperm pollen. The flora producing Triprojectacites - type pollen became extinct in Late Maastrichtian. The active settling of western Siberia by "Norma" flora was confined to the beginning of the Palaeogene. Parallel with Normapolles representatives of Myricaceae, Fagaceae, Ulmaceae, Juglandaceae, Betulaceae, etc. originated and formed. They forced Out the short-lived group of large-pollen "Norma" by the end of Paleocene.