Devonian - Silurian Castine Formation (MEDSca;0)

State	Maine
Name	Devonian - Silurian Castine Formation
Geologic age	Devonian - Silurian
Original map label	DSca
Comments	Named for Castine Peninsula, Hancock Co., south-central ME. Consists of light-colored, altered lavas and pyroclastics, including rhyolites, dacites, and andesites. Relations indicate that Castine formation, Islesboro formation, and North Haven greenstone are nearly contemporaneous. (ME025) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; Protolith E - Mafic to felsic volcanic rocks
Primary rock type	mafic volcanic rock
Secondary rock type	felsic volcanic rock
Other rock types
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanicGS - Greenschist facies; Protolith E - Mafic to felsic volcanic rocks Igneous > Volcanic > Felsic-volcanicGS - Greenschist facies; Protolith E - Mafic to felsic volcanic rocks
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. Smith, G.O., Bastin, E.S. and Brown, C.W., 1907, Description of the Penobscot Bay quadrangle [Maine]: U.S. Geological Survey Geologic Atlas of the United States, Penobscot Bay folio, no. 149, 14 p. [http://pubs.er.usgs.gov/publication/gf149] Stewart, D.B., and Tucker, R.G., 1998, Geology of northern Penobscot Bay, Maine: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2551. [http://pubs.er.usgs.gov/publication/i2551] Brookins, D.G., Berdan, J.M. and Stewart, D.B., 1973, Isotopic and paleontologic evidence for correlating three volcanic sequences in the Maine coastal volcanic belt: Geological Society of America Bulletin, v. 84, no. 5, p. 1619-1628. USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Hancock - Knox