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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 51 (1981)No. 1. (March), Pages 197-202

A Nearshore Sponge Spicule Mat from the Pennsylvanian of West-Central Indiana

N. Gary Lane

ABSTRACT

A thin (3-6) cm) interval in the Perth Limestone Member of the Staunton Formation (Pennsylvanian, Desmoinesian) in Warren County, Indiana, contains abundant small siliceous sponge spicules that form a spicule mat. The limestone is a grain-supported packstone with a micritic matrix, the predominant grains being small sponge spicules that range down to a few micrometers in size. The intermeshed spicules helped support a wide variety of vagile and sessile benthonic marine invertebrates on a lime mud bottom. In contrast to other spiculites that are basinal deposits, the spiculite reported here developed in shallow water, probably no more than 90 feet deep, as part of a cyclothemic sequence that includes coals and fluviatile channel sandstones above and below the Perth.


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