Acritarch Elektoriskos? williereae (G. & M. Deflandre, 1965) Vanguestaine, 1979 emend. nov. from the Upper Ordovician of the Siberian Platform: New Morphological and Stratigraphic Data

The morphology of acritarch species Elektoriskos? williereae (G. & M. Deflandre, 1965) Vanguestaine, 1979, previously considered as a Silurian index of the Llandovery, has been clarified, the diagnosis emended, and the stratigraphic distribution expanded. According to new data, the first appeara...

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Bibliographic Details
Published in:Stratigraphy and geological correlation 2021-11, Vol.29 (6), p.641-654
Main Authors: Raevskaya, E. G., Dronov, A. V.
Format: Article
Language:English
Subjects:
Archaeology
Earth and Environmental Science
Earth Sciences
Fossils
Geophysics/Geodesy
Historical Geology
Morphology
Ordovician
Paleoenvironments
Palynology
Platforms (geology)
Sedimentology
Silurian
Species
Stratigraphy
Structural Geology
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Summary:The morphology of acritarch species Elektoriskos? williereae (G. & M. Deflandre, 1965) Vanguestaine, 1979, previously considered as a Silurian index of the Llandovery, has been clarified, the diagnosis emended, and the stratigraphic distribution expanded. According to new data, the first appearance of E.? williereae was confined to the upper part of the Baksan Horizon near the boundary of the Sandbian and Katian stages of the Upper Ordovician. Co-occurrence of E.? williereae with representatives of the genera Gordonirundum , Nirundella , Peteinosphaeridium , and Sacculidium is a distinct, well-recognizable palynological characteristic of the Katian deposits of the Siberian Platform which can serve for identification, dating, and correlation of the acritarch-bearing strata. Morphological variations in E.? williereae are a stable diagnostic feature of the species that distinguishes it from other taxa. It is possible that the species was sensitive to paleoenvironments and, probably, highly adaptive, which allowed it, remaining almost unchanged, to overcome the global Late Ordovician cooling, which became fatal for many other groups of organisms.
ISSN:0869-5938
1555-6263
DOI:10.1134/S0869593821060071