Abstract

A practical fusulinid zonation for the Pennsylvanian and Permian is presented, with emphasis upon commonly-occurring species within the Permian Basin. The zonation, however, has worldwide implications built in, so that the problems of endemism are minimized. The Pennsylvanian Morrowan is divided into two main zones covering ±7.0 m.y.; the Desmoinesian (Strawn) is divisible into five zones of ±8.0 m.y.; the Missourian (Canyon) consists of four zones of ±4.5 m.y.; and the Virgilian (Cisco) is divided into three main zones covering ±3.5 m.y. The Permian Wolfcampian consists of three main zones of ±14.0 m.y.; the Leonardian contains three zones of ±14.5 m.y.; the early and middle Guadalupian (Road Canyon - Brushy Canyon - Cherry Canyon fms.) consists of four zones of ±6.5 m.y.; the late Guadalupian (Capitan - Bell Canyon fms.) is separated into two main zones of ±2.5 m.y.; and Djulfian (represented in the Permian Basin largely by evaporites), is divisible into two main zones on a worldwide basis, covering ±3.0 m.y. No attempt is made herein to assign coastal onlap and eustacy curves to this zonation, a task best left to those who have access to seismic data around the world.