 The base of the Kasimovian stage is at the base of the fusulinid biozone of "Obsoletes obsoletes" and "Protriticites pseudomontiparus" or with the first appearance of the ammonite genus "Parashumardites".The top of the stage is close to the first appearances of the fusulinid genera "Daixina", "Jigulites" and "Rugosofusulina" or the first appearance of the conodont "Streptognathodus zethus".The golden spike for the Kasimovian stage had not yet been assigned as of 2008.