Ordovician - Precambrian Z Columbia Falls Formation (MEOZcf;0)

State	Maine
Name	Ordovician - Precambrian Z Columbia Falls Formation
Geologic age	Ordovician - Precambrian Z
Original map label	OZcf
Comments	GS - Greenschist facies Protolith X - Undetermined volcanic rocks
Primary rock type	mafic volcanic rock
Secondary rock type	felsic volcanic rock
Other rock types
Lithologic constituents	Major Igneous > Volcanic > Felsic-volcanicGS - Greenschist facies Protolith X - Undetermined volcanic rocks Igneous > Volcanic > Mafic-volcanicGS - Greenschist facies Protolith X - Undetermined 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.
Geographic coverage	Washington