graptolite shale

graptolite shale

[′grap·tə‚līt ′shāl]
(geology)
Shale containing an abundance of extinct colonial marine organisms known as graptolites.
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References in periodicals archive ?
Metallogenesis of early Paleozoic graptolite shales from the Graefenthal Horst (Northern Bavaria-Federal Republic of Germany): Economic Geology, 81, 889-903.
Metallogenesis of Early Palaeozoic graptolite shales from the Graefenthal Horst (North Bavaria-Federal Republic of Germany) // Economic Geology.