New data on middle and late Albian foraminifera and biostratigraphy of the northern palaeobiogeographical district of western Siberia
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Date
2015-03
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Bogucki Wydawnictwo Naukowe
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Abstract
The present paper discusses foraminiferal assemblages and biozones established on the basis of studies of samples
from ten borehole sequences of the Khanty-Mansiysk Horizon in the Samotlor area of the northern palaeobiogeograph -ical district of western Siberia (Russia). In this region, middle and late Albian foraminiferal assemblages were first
distinguished in western Siberia. Levels from which these assemblages have been recovered, are here referred to the
following foraminiferal zones, the Ammobaculites fragmentarius–Gaudryinopsis filiformis Zone (middle Albian) and the
Ammotium braunsteini–Verneuilinoides borealis assanoviensis Zone (upper Albian). Zonal assemblages are dominated by
representatives of the orders Ammodiscida, Textulariida and Ataxophragmiida. Species of the ataxophragmiid genera
Verneuilinoides, Pseudoverneuilina and Gaudryinopsis are the most characteristic, inclusive of several key index forms.
Foraminiferal tests consist of agglutinated quartz-silica, the wall microstructure being almost exclusively medium and
coarse grained. In specific composition, the Albian assemblages from the Samotlor area are similar to those from Tran -suralia (Russia) and to the Canadian Province, which, together with West-Siberian Province, forms the Arctic palaeo -biogeographical realm.
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Keywords
foraminifera, biostratigraphy, Albian, West-Siberian Province
Citation
Geologos, 2015, 21, 1, s.71-78
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ISBN
978-83-232187-4-6
ISSN
1426-8981