Ordovician Kennebec Formation (MEOk;0)

State	Maine
Name	Ordovician Kennebec Formation
Geologic age	Ordovician
Original map label	Ok
Comments	Named for Kennebec River. Type locality is 1/4 mi northeast of Somerset Junction on northwest side of abandoned railroad right-of-way on northwest side of west branch of Kennebec River, Brassua Lake 15-min quad, northern Somerset Co., western ME. Occurs in belt about 5 mi long northeast to southwest through Somerset Junction. Consists of olive-drab, white-weathering, massive felsite and rhyolite tuff. Thickness unknown, probably from a few hundred feet to a thousand feet. Contact relationships unknown. Report includes geologic map and correlation chart. (ME003) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith T - Rhyolitic volcanic rocks
Primary rock type	rhyolite
Secondary rock type
Other rock types
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanic > Rhyolite (Pyroclastic, tuff)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith T - Rhyolitic 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. 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. [http://pubs.er.usgs.gov/publication/b1111E] Boucot, A.J., 1969, Geology of the Moose River and Roach River synclinoria, northwestern Maine: Maine Geol. Surv., Bull. 21, 123 p. USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Somerset