Metadiabase

Variably metamorphosed dikes, sills and subconcordant sheets of diabasic rocks. Probably coeval (in part) with volcanic rocks of Hemlock Formation (unit Xh)
State Michigan
Name Metadiabase
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > Metadiabase
Comments Cannon (2004, pers. comm.) no longer believes that these rocks are coeval with the Hemlock Formation.
References
NGMDB product
Counties Iron