Abstract
Systematic study of microfossil associations on the Krivi Potok section (Gucevo Mt. area, NW Serbia) has been carried out to document and to refine the Lower Triassic stratigraphic correlations within Alpine-Mediterranean domain. Field investigation and laboratory process have enabled the identification of lowermost Olenekian (lower Smithian) conodonts, ostracodes and pyrite framboids. Two conodont zones are established in this region, in ascending order they are: Pachycladina obliqua-Foliella gardenae Assemblage Zone and Neospathodus planus Zone. A new ostracode species Paracypris ? krivipotokensis FOREL n. sp. has been described, it co-occurs with conodont Neospathodus planus within the Zone of the same name. The pyrite framboids were formed within the ostracode carapaces after their death. The size distribution of pyrite framboids supports the former suggestion that large size (>6 ?m in diameter) is not suitable for the reconstruction of seawater redox conditions.
Highlights
The Lower Triassic sediments are widespread in the Jadar Block of Northwestern Serbia
It is predominantly built of Lower Triassic sediments, which the Serbian authors mostly divided in the older „Seisian” and the younger „Campilian” beds
Each ca. 2.5 kg, are collected from the Krivi Potok section for conodont study, and same number of thin sections were done from each level with the conodont samples for the petrographic purposes
Summary
The Lower Triassic sediments are widespread in the Jadar Block of Northwestern Serbia. Together with the Upper Permian rocks and the Permian–Triassic boundary interval, they have been intensively studied especially because represent the only such formations of this age in Serbia. The Upper Permian sediments contain diverse macro- and microbiocenoses, whereas the Lower Triassic microfossil associations are rather poor. Gučevo Mt. is situated in the north-western part of the Jadar Block, on the eastern side of the Drina River and southern of the Loznica town (Fig. 1). It is predominantly built of Lower Triassic sediments, which the Serbian authors mostly divided in the older „Seisian” and the younger „Campilian” beds. After repeated numerous field investigations of this area, authors of the paper intended to document new geological data to refine existing stratigraphic and lithostratigraphic definitions
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