Silurian Maple Mountain Formation

Silurian Maple Mountain Formation
State Maine
Name Silurian Maple Mountain Formation
Geologic age Silurian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > Sandstone (Bed)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone
Comments Secondary unit description from USGS Geologic Names lexicon (ref. ME078): Named the Hersey red shale member of the Pembroke formation for exposures on Hersey Neck, Washington Co., ME. Consists of purplish red fossiliferous shale; includes some gray shale like that of Leighton member. Thickness is 2700 feet. The Hersey is the top member of the Pembroke formation and is separated from the older Leighton gray shale member by rhyolite tuff. Unit is of Late Silurian age. GS - Greenschist facies; Protolith Q - Interbedded pelite and sandstone
Stratigraphic units Hovey 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.

Pavlides, L., 1964, The Hovey Group of northeastern Maine: U.S. Geol. Surv., Bull. 1194-B, 6 p.

NGMDB product
Counties Aroostook