Devonian Seboomook Formation Day Mountain member (MEDsd;0)

State	Maine
Name	Devonian Seboomook Formation Day Mountain member
Geologic age	Devonian
Lithologic constituents	Major Metamorphic > Schist > Pelitic-schist (Greenschist, Amphibolite)Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies. Metamorphic > Metasedimentary > Metaclastic > Metasandstone (Greenschist, Amphibolite)Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies. Metamorphic > Metasedimentary > Metaclastic > Metasiltstone (Greenschist, Amphibolite)Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies.
Comments	Named as a member of the Seboomook formation after Camera Hill, southwest part of Spencer Lake 15-min quad, Somerset Co., ME. Type section is on Camera Hill. Consists of dark-green, gray- to rusty-brown-weathering felsite with scattered feldspar phenocrysts and some vesicles near the base. Thickness ranges from 0 to 400 ft. Member occurs as discrete, probably conformable bodies within the Seboomook formation; contacts were not observed. Age is Devonian (Oriskany) because it lies above faunule of Oriskany age in the Seboomook formation. (ME003) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; Protolith V - Basaltic volcanic rocks.
Stratigraphic units	Seboomook 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. Moench, R.H., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., Hussey, A.M., III, Marvinney, R.G. and Aleinikoff, J.N., 1995, Geologic map of the Sherbrooke-Lewiston area, Maine, New Hampshire, and Vermont, United States, and Quebec, Canada: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1898-D, 56 p., 2 sheets, scale 1:250,000, Prepared in cooperation with the Maine Geological Survey and the New Hampshire Geological Survey. https://pubs.er.usgs.gov/publication/i1898D US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.
NGMDB product	NGMDB product page for 16547
Counties	Franklin - Oxford - Somerset

State

Name

Devonian Seboomook Formation Day Mountain member

Geologic age

Devonian

Lithologic constituents

Major

Metamorphic > Schist > Pelitic-schist (Greenschist, Amphibolite)Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies.

Metamorphic > Metasedimentary > Metaclastic > Metasandstone (Greenschist, Amphibolite)Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies.

Metamorphic > Metasedimentary > Metaclastic > Metasiltstone (Greenschist, Amphibolite)Protolith Q - Interbedded pelite and sandstone; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; E - Epidote-amphibolite facies; GS - Greenschist facies.

Comments

Named as a member of the Seboomook formation after Camera Hill, southwest part of Spencer Lake 15-min quad, Somerset Co., ME. Type section is on Camera Hill. Consists of dark-green, gray- to rusty-brown-weathering felsite with scattered feldspar phenocrysts and some vesicles near the base. Thickness ranges from 0 to 400 ft. Member occurs as discrete, probably conformable bodies within the Seboomook formation; contacts were not observed. Age is Devonian (Oriskany) because it lies above faunule of Oriskany age in the Seboomook formation. (ME003) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; Protolith V - Basaltic volcanic rocks.

Stratigraphic units

Seboomook 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.

Moench, R.H., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., Hussey, A.M., III, Marvinney, R.G. and Aleinikoff, J.N., 1995, Geologic map of the Sherbrooke-Lewiston area, Maine, New Hampshire, and Vermont, United States, and Quebec, Canada: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1898-D, 56 p., 2 sheets, scale 1:250,000, Prepared in cooperation with the Maine Geological Survey and the New Hampshire Geological Survey.

https://pubs.er.usgs.gov/publication/i1898D

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

NGMDB product

NGMDB product page for 16547

Counties

Franklin - Oxford - Somerset