graptolite shale

graptolite shale

[′grap·tə‚līt ′shāl]
(geology)
Shale containing an abundance of extinct colonial marine organisms known as graptolites.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Available geological data indicate that the Lower Silurian graptolite shales represent the most prospective source rock body for shale gas exploration in west Lithuania.
Metallogenesis of early Paleozoic graptolite shales from the Graefenthal Horst (Northern Bavaria-Federal Republic of Germany): Economic Geology, 81, 889-903.