New Records of Ammonoids from the Mid-Carboniferous Boundary Beds of the Iset Section (Middle Urals)

A Late Serpukhovian ammonoid assemblage was recovered from the Mid-Carboniferous boundary beds cropping out in an active stone crushing quarry on the right bank of the Iset River (Middle Urals). The ammonoid assemblage includes Epicanites sp., Stenopronorites uralensis (Karpinsky) , Delepinoceras bressoni Ruzhencev , Proshumardites principalis Ruzhencev et Bogoslovskaya , Deleshumardites delepinei (Schindewolf), Stenoglaphyrites isetensis sp. nov. , Glaphyrites sp ., Fayettevillea sp. , Syngastrioceras sp., Eumorphoceras aff . transuralense Ruzhencev et Bogoslovskaya, characterizing the Deleshumardites-Delepinoceras (= Fayettevillea-Delepinoceras ) Genozone, which correlates with the E 2 zone of Europe and its equivalents throughout the world. The assemblage is described and compared with ammonoid associations of this age from other regions of the world. A new species, Stenoglaphyrites isetensis Nikolaeva sp. nov., is described.