Mineral Resources On-Line Spatial Data
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|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|
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
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.
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.
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