Devonian Seboomook Formation Camera Hill Greenstone

Devonian Seboomook Formation Camera Hill Greenstone
State Maine
Name Devonian Seboomook Formation Camera Hill Greenstone
Geologic age Devonian
Lithologic constituents
Major
Metamorphic > Metaigneous > Greenstone (Greenschist)GS - Greenschist facies; Protolith V - Basaltic volcanic rocks
Comments Raised to group rank following the usage of Pollock (1987). In Piermont sequence of Piermont-Frontenac allochthon, contains newly defined Ironbound Mountain Formation (northwest of Thrasher Peaks and Foster Hill faults). Includes an upper unnamed shale and sandstone unit, greenstone at Camera Hill (previously mapped as Camera Hill Greenstone Member of Seboomook Formation by Boucot (1961)), and a lower well-bedded shale and sandstone unit in the Bronson Hill-Boundary Mountains anticlinorium. In central Maine trough, includes Day Mountain, Temple Stream, Mount Blue Formations (all three previously members of Seboomook Formation), and Hildreths and Carrabassett Formations. Type section of the Seboomook Formation (designated by Boucot (1961)) is now assigned to Northeast Carry Formation, also of Seboomook Group but is outside of this map area. (ME004) Unit description from USGS GEOLEX website (ME078). AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; 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

US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.

NGMDB product
Counties Somerset