Nebraska Invertebrate Fossils - Crinoid Fossil from the Beil Limestone Member, Lecompton Formation, Late Pennsylvanian (Virgilian), Cass County, Nebraska

Introduction

Sac spine of a large Pirasocrinid (crinoid) in the Beil Limestone, Cass County, Nebraska.The Beil here does not have a very diverse fossil assemblage, only a few brachiopods, crinoid plates and fusulinids having been found among the abundant corals.

Outcrop of King Hill Shale and Beil Limestone Members of the Lecompton Formation, Cass County, Nebraska
Outcrop of King Hill shale and Beil Limestone members of the Lecompton Formation, in Cass County, Nebraska. The King Hill is the overlying red bed that indicates sub-aerial conditions and soil development. The Beil Limestone is a regressive limestone that is rotten near the top---that is, it has been altered by sub-aerial exposure and many of the fossils in this unit show evidence of ancient weathering.
Sac Spine

Sac Spine

Description: Sac spine of a large Pirasocrinid (crinoid) in the Beil Limestone, Cass County, Nebraska.The Beil here does not have a very diverse fossil assemblage, only a few brachiopods, crinoid plates and fusulinids having been found among the abundant corals.