Silurian - Ordovician Frontenac Formation, Canada Falls volcanic member

Silurian - Ordovician Frontenac Formation Canada Falls volcanic member
State Maine
Name Silurian - Ordovician Frontenac Formation, Canada Falls volcanic member
Geologic age Silurian - Ordovician
Lithologic constituents
Major
Igneous > Volcanic > Mafic-volcanic > BasaltW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist facies; Protolith V - Basaltic volcanic rocks
Comments Aroostook River Formation here named in northeastern ME. Unit is thin-bedded gray to green-gray calcareous slate interlayered with graywacke and siltstone. 600 m thick. Overlies Madawaska Lake Formation; conformably underlies Frenchville Formation. (ME029) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith Q - Interbedded pelite and sandstone.
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.

Marvinney, R.G., 1989, Bedrock geology of the southeastern margin of the Connecticut Valley-Gaspe synclinorium in Somerset County, Maine, IN Berry, A.W., Jr., Guidebook for field trips in southern and west-central Maine: New England Intercollegiate Geological Conference Guidebook, 81st Annual Meeting, Farmington, ME, October 13-15, 1989, p. 212-237.

US Geological Survey, 2005, National Geologic Map Database, Geologic Names Lexicon "GEOLEX", http://ngmdb.usgs.gov/Geolex/.

NGMDB product
Counties Somerset