Silurian Leighton Formation, mafic to felsic volcanic rock member

Silurian Leighton Formation mafic to felsic volcanic rock member
State Maine
Name Silurian Leighton Formation, mafic to felsic volcanic rock member
Geologic age Silurian
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanicGS - Greenschist facies; Protolith W - Mafic to felsic volcanic rocks
Igneous > Volcanic > Felsic-volcanicGS - Greenschist facies; Protolith W - Mafic to felsic volcanic rocks
Comments Secondary unit description from USGS Geologic Names lexicon (re. ME078): Used as Early Silurian(?) Greenvale Cove Formation. Consists of grayish-violet interlaminated metashale, feldspathic metasandstone, and calc-silicate rock of Piermont allochthon of western NH. GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; Protolith J - Calcareous lithic sandstone
Stratigraphic units Pembroke Group
References

Osberg, P.H., Hussey, A.M., and Boone, G.M., 1985, Bedrock geologic map of Maine: Maine Geological Survey, Dept. of Conserv., scale 1:500,000.

NGMDB product
Counties Washington