The Auxiliary boundary Stratotype Section and Point (ASSP) of the Jiangshanian Stage (Cambrian: Furongian Series) in the Kyrshabakty section, Kazakhstan

Abstract

The Kyrshabakty section in the Malyi Karatau Range, southern Kazakhstan, has been approved as the Auxiliary boundary Stratotype Section and Point (ASSP) for the base of the Jiangshanian Stage of the Furongian Series (Cambrian System). The first appearance datum (FAD) of the agnostoid trilobite Agnostotes orientalis coincides with the horizon marking the base of the Jiangshanian Stage, and the FAD of A. orientalis occurs at 259.0 m in the measured section, 61.2 m above the base of Unit 8 in the Zhumabai Formation. The boundary interval in the Kyshabakty section shows a relatively monotonous succession of carbonate deposits. The section contains an abundance of Cambrian fossils including diverse trilobites, brachiopods, molluscs, bradoriids, protoconodonts and paraconodonts.