Devonian Seboomook Formation Mount Blue member (MEDsm;0)

State	Maine
Name	Devonian Seboomook Formation Mount Blue member
Geologic age	Devonian
Original map label	Dsm
Comments	Rank raised to formation of the Seboomook Group following usage of Pollock (1987). Occurs in central Maine trough in western ME and consists of cyclically interbedded pelitic schist and graded metasiltstone and metasandstone. Similar to Day Mountain and Carrabassett Formations, also of Seboomook Group, but contains smaller proportion of arenaceous rocks than Day Mountain and a larger proportion than Carrabassett. In areas of migmatitic gneiss, lower part may contain abundant remnants of underlying Hildreths Formation of Seboomook Group. (ME004) Unit description from USGS GEOLEX website (ME078). AA - Low rank amphibolite facies AB - Medium rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies Protolith Q - Interbedded pelite and sandstone
Primary rock type	schist
Secondary rock type	metasedimentary rock
Other rock types
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > Pelitic-schistProtolith Q - Interbedded pelite and sandstone AA - Low rank amphibolite facies AB - Medium rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneProtolith Q - Interbedded pelite and sandstone AA - Low rank amphibolite facies AB - Medium rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies Metamorphic > Metasedimentary > Metaclastic > MetasiltstoneProtolith Q - Interbedded pelite and sandstone AA - Low rank amphibolite facies AB - Medium rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies
Map references	Digital bedrock data downloaded from Maine Office of GIS in September 2005 from http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock Bedrock units table (publication date 11/15/2002) downloaded from same site. Permission to redistribute these data granted by Dr. Robert Marvinney, State Geologist of Maine, in September 2006. [http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock]
Unit 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. [http://pubs.er.usgs.gov/publication/i1898D] USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Franklin - Oxford - Piscataquis - Somerset