|Name||Cambrian Hurricane Mountain Formation, metaquartzwacke|
Metamorphic > Metasedimentary > Metaclastic > Metasandstone > Metagraywacke (Zeolitic (prehnite-pumpellyite))metaquartzwacke; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith E - Feldspathic sandstone
|Comments||Late Proterozoic Islesboro Formation considered to be distal facies of North Haven Greenstone, Ellsworth Schist, and schist at Columbia Falls (eastern coastal ME). North Haven is predominantly pillowed and phyllitic greenstone (basalt and basaltic andesite) with minor silicic tuff, breccia, and pelite (Pinette and Osberg, 1989). North Haven unconformably underlies Silurian rocks containing Atlantic fauna. Age is changed to Late Proterozoic to Ordovician. (ME072) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; Protolith V - Basaltic volcanic rocks.|
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.
US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.