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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 of the Lower – Middle Carboniferous Boundary Layers in the Muradymovo Section of the Southern Urals