Ordovician Benner Hill Formation

Ordovician Benner Hill formation
State Maine
Name Ordovician Benner Hill Formation
Geologic age Ordovician
Lithologic constituents
Major
Metamorphic > Gneiss (Amphibolite)felsic gneiss; lithology is assigned based on interpretation of rock unit derived from metamorphic isograds laid over the protolith map (done by M.P. Foose and Julie Mueller, USGS).
Minor
Sedimentary > Clastic > SandstoneAA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; E - Epidote-amphibolite facies; Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > MudstoneAA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; E - Epidote-amphibolite facies; Protolith Q - Interbedded pelite and sandstone
Comments AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith Q - Interbedded pelite and sandstone
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.

Boucot, A.J., 1961, Stratigraphy of the Moose River synclinorium, IN Contributions to general geology, 1959: U.S. Geological Survey Bulletin, 1111-E, p. E153-E188.

https://pubs.er.usgs.gov/publication/b1111E

NGMDB product
Counties Knox