New Ammonoids from the Devonian–Carboniferous Boundary Beds in Berchogur (Western Kazakhstan)

Abstract

© 2020, Pleiades Publishing, Ltd. Abstract: Old and new ammonoid collections from the Devonian–Carboniferous Boundary Section in Berchogur (Western Kazakhstan) are examined. The ammonoids come from the Acutimitoceras Genozone, from beds similar in age to the Stockum Fauna of Germany. The assemblage includes mostly species of the genera ?Imitoceras and Acutimitoceras, with diverse shapes of initial whorls. The new species Acutimitoceras alabasense sp. nov. and A. dzhanganense sp. nov. are described.