Late Triassic radiolarians from the Grivska formation, internal Dinarides, SW Serbia

Nikita Bragin,Natasa Gerzina-Spajic,Liubov Bragina,Nevenka Djeric

doi:10.2298/gabp1901017b

Nikita Bragin, Natasa Gerzina-Spajic + Show 2 more

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https://doi.org/10.2298/gabp1901017b

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Abstract

Upper Triassic (upper carnian - rhaetian) grey cherty limestone are known in the internal Dinarides under the name of ?Grivska Formation?. Sediments of the Grivska Formation are characterized by microfossils only - conodonts and radiolarians, and did not yield any macrofossils. Micropa - laeontological research of Upper Triassic siliceous rocks was performed at the locality Lim river, in the vicinity of Bistrica Village in SW Serbia. Radiolarian assemblages are characterized by such species as Capnodoce anapetes De Wever, C. sarisa De Wever, Sarla hadrecaena (De Wever), Praehexasaturnalis tenuispinosus (Donofrio & Mostler), Xiphothecaellla longa (Kozur & Mock). According to the radiolarian data, the investigated cherts are of latest carnian to early norian age.

Highlights

The Triassic hemipelagic deposits of moderate thickness, which are represented by platy cherty limestone intercalated with marl and clay, in parts with coarser-grained allodapic layers and common chert nodules and layers, are known in the Internal Dinarides under the name of “Grivska Formation”
SUDAR (1986, 1996) distinguished Ladinian, Carnian and Norian cherty limestones using conodont dating, but these data were rarely used in geological studies, and the Grivska Formation was de ined and mapped mostly on the base of its macroscopic lithological attributes, without biostratigraphic and detailed microfacies investigations
The term Grivska Formation has been used broadly for the all Ladinian to Late Jurassic strati ied cherty limestones in all units that derived from the Adriatic passive margin

Summary

Introduction

The Triassic hemipelagic deposits of moderate thickness (up to several hundred meters), which are represented by platy cherty limestone intercalated with marl and clay, in parts with coarser-grained allodapic layers and common chert nodules and layers, are known in the Internal Dinarides under the name of “Grivska Formation”. SUDAR (1986, 1996) distinguished Ladinian, Carnian and Norian cherty limestones using conodont dating, but these data were rarely used in geological studies, and the Grivska Formation was de ined and mapped mostly on the base of its macroscopic lithological attributes, without biostratigraphic and detailed microfacies investigations.

Results

Conclusion