Geologicheskii Vestnik

Ostracode assemblages of the Lower and mMiddle Carboniferous boundary interval in the Muradymovo section are characterized. This is a reference section for the base of the Bashkirian stage of Russia as it has been stratigraphically subdivided based on four groups of fossils (foraminifers, conodonts, ammonoids, ostracodes). The Pseudoparaparchites celsus Zone, characterizes the Yuldybaevian regional Horizon of the Serpukhovian (Lower Carboniferous). Fellerites gratus Zone and the Beds with Limnoprimitia cf. arcuatа characterize the Bogdanovkian regional Horizon of the Bashkirian (Middle Carboniferous). The Pseudoparaparchites celsus Zone (Assemblage I) includes 28 species of 24 genera. The Fellerites gratus Zone (Assemblage II) includes 48 species of 38 genera. The representatives of Kirkbya, as well as the genera Polytylites, Amphizona, Kellettina, Editia account for the peculiarity of this assemblage in the Muradymovo Section. The Beds with Limnoprimitia cf. arcuata are characterized by Assemblage III, including nine species of seven genera with the index species. The Fellerites gratus Zone ostracode assemblage has been found three meters above the base of the Bashkirian Stage drawn based on the first appearance of the conodont marker species Declinognathodus noduliferus (Ellison et Graves, 1941).

ostracodes, Lower Carboniferous, Middle Carboniferous, Southern Urals

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