Ordovician - Cambrian Aziscohos Formation (MEOCAz;0)

State	Maine
Name	Ordovician - Cambrian Aziscohos Formation
Geologic age	Ordovician - Cambrian
Original map label	OCAz
Comments	Divisible into lower member of black to dark-gray, thinly laminated carbonate shale and minor feldspathic quartzite, 2,000 m thick and upper member of gray, thinly laminated shale and siltstone, 600 m thick. Underlies Albee Formation. Used in ME and NH as far east as 70 deg 45' at east edge of Cupsuptic quad; Dead River Formation is eastward equivalent of Aziscohos and Albee Formations. Age is Early Ordovician. (ME041) Unit description from USGS GEOLEX website (ME078). E - Epidote-amphibolite facies AA - Low rank amphibolite facies AB - Medium rank amphibolite facies Protolith A - Pelite
Primary rock type	shale
Secondary rock type	quartzite
Other rock types	siltstone
Lithologic constituents	Major Metamorphic > Metasedimentary > Metaclastic > QuartziteProtolith A - Pelite E - Epidote-amphibolite facies AA - Low rank amphibolite facies AB - Medium rank amphibolite facies Sedimentary > Clastic > Mudstone > ShaleProtolith A - Pelite E - Epidote-amphibolite facies AA - Low rank amphibolite facies AB - Medium rank amphibolite facies Sedimentary > Clastic > SiltstoneProtolith A - Pelite E - Epidote-amphibolite facies AA - Low rank amphibolite facies AB - Medium rank amphibolite 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. and Pankiwskyj, K.A., 1988, Geologic map of western interior Maine: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1692, 21 p., 1 sheet, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i1692] USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Oxford