| 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
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| 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 |