Graptolite shale | Article about graptolite shale by The Free Dictionary
graptolite shale[′grap·tə‚līt ′shāl]
Shale containing an abundance of extinct colonial marine organisms known as graptolites.
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.
ascensus at the base of member 74 within a continuous succession of graptolite shales
Metallogenesis of Early Palaeozoic graptolite shales
from the Graefenthal Horst (North Bavaria-Federal Republic of Germany) // Economic Geology.