Skip to main content

Devonian Heald Mountain Rhyolite dark tuff member

Devonian Heald Mountain Rhyolite dark tuff member
State Maine
Name Devonian Heald Mountain Rhyolite dark tuff member
Geologic age Devonian
Comments Rocks previously mapped as Heald Mountain Rhyolite of Moose River Group by Boucot and Heath (1969) are here reassigned to Kineo Volcanic Member of Tomhegan Formation of Moose River Group. (ME004) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies
Primary rock type rhyolite
Secondary rock type
Other rock types
Lithologic constituents
Igneous > Volcanic > Felsic-volcanic > RhyoliteGS - Greenschist facies
Map references
Digital bedrock data downloaded from Maine Office of GIS in September 2005 from 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.
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., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., Hussey, A.M., III, Marvinney, R.G. and Aleinikoff, J.N., 1995, Geologic map of the Sherbrooke-Lewiston area, Maine, New Hampshire, and Vermont, United States, and Quebec, Canada: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1898-D, 56 p., 2 sheets, scale 1:250,000, Prepared in cooperation with the Maine Geological Survey and the New Hampshire Geological Survey.
USGS Geologic Names Lexicon (GEOLEX)
Counties Somerset