Mineral Resources On-Line Spatial Data
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|Name||Ordovician - Cambrian Cookson formation|
|Geologic age||Ordovician - Cambrian|
|Original map label||OCAc|
|Comments||Most of the rocks are rusty weathering, highly carbonaceous black slate and phyllite with very minor beds of quartzwacke. Minimum thickness of the restricted Cookson is estimated at 1000 m. Cookson probably correlates with Ship Cove Formation of the St. John Group in New Brunswick. Identical in lithology and age to the Benton Slate of the Miramichi anticlinorium. (ME069) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies Protolith C - Sulfidic/carbonaceous pelite|
|Primary rock type||slate|
|Secondary rock type||phyllite|
|Other rock types||graywacke|
Metamorphic > Metasedimentary > Metaclastic > Slateblack slate GS - Greenschist facies Protolith C - Sulfidic/carbonaceous pelite
Metamorphic > Metasedimentary > Metaclastic > Phylliteblack slate GS - Greenschist facies Protolith C - Sulfidic/carbonaceous pelite
Sedimentary > Clastic > Sandstone > Graywackeblack slate GS - Greenschist facies Protolith C - Sulfidic/carbonaceous pelite
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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