T50 Reconstructing Events of the Late Devonian: Fossil and Rock Record Insights into a Dynamic Biosphere I

Tuesday, 27 October 2020
10:00 AM - 12:00 PM
Meeting Rooms

NEW PALYNOLOGICAL DATA FROM DEVONIAN DEPOSITS OF SOUTH-CENTRAL POLAND (MIŁOSZÓW, HOLY CROSS MOUNTAINS)

Paper number: T50-5
Program: Technical Sessions
Time: 10:50 AM – 11:05 AM

Authors

Abstract

The palynological investigation was carried out on the Middle/Upper Devonian deposits from Miłoszów. The analyzed section is located within the Łysogóry area (Holy Cross Mountains, south-central Poland). All samples revealed abundant and well-preserved palynomorphs assemblage, containing both: the terrestrial and marine components.

Within the miospore assemblage several taxa important for stratigraphy were recognized: Aneurospora extensa, Chelisnospora concinna, Cymbosporites magnificus, Densosporites devonicus, , Geminospora lemurata, Rhabdosporites langii and Samarisporites triangulatus. Using the microspore zonation the age of the investigated interval was established as a local “Geminospora” Extensa zone, which corresponds with uppermost Givetian. The lowest part of the Ex 3-subzone is thought to be an equivalent of the Taghanic Event interval. Globally, the Taghanic Event is marked by the decrease in the miospore diversification. Very similar phenomenon was observed in samples obtained from Miłoszów. Two of the most numerous taxa, Aneurospora extensa and Rhabdosporites langii remained in noticeable relation. The total amount of the R. langii decreased and A. extensa showed remarkable increase in number. This change was correlated with the sea-level rising noticed within the Ex 3-subzone with the maximum occurring within the top of this subzone. This might suggest a putative signal of transgression. This environmental alternation could reduce the natural habitats of the R. langii producers and this caused the reduction of those spores. The climatic changes showed by microfossils record might be related with the Taghanic event but further investigation has to be done.

This project was financially supported by NCN grant 2017/N/ST10/01699 (for M. Kondas, University of Silesia in Katowice).

Geological Society of America Abstracts with Programs. Vol. 52, No. 6

doi: 10.1130/abs/2020AM-356134

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