Devonian - Silurian Madrid Formation

Devonian - Silurian Madrid Formation
State Maine
Name Devonian - Silurian Madrid Formation
Geologic age Devonian - Silurian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Quartzite (Zeolitic (prehnite-pumpellyite))AA - Low rank amphibolite facies; Protolith M - Calcareous sandstone; interbedded sandstone and impure limestone
Metamorphic > Metasedimentary > Calc-silicate-rock (Zeolitic (prehnite-pumpellyite))AA - Low rank amphibolite facies; Protolith M - Calcareous sandstone; interbedded sandstone and impure limestone
Comments W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith S - Interbedded pelite, sandstone, and limestone and/or dolostone
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.

Cariani, A.R., 1959, The geology of the Anson quadrangle, Maine: Dissertation Abstracts, v. 19, no. 10, p. 2577.

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

NGMDB product
Counties Aroostook - Franklin - Kennebec - Oxford - Penobscot - Piscataquis - Somerset