Silurian Sangerville Formation

Silurian Sangerville Formation
State Maine
Name Silurian Sangerville Formation
Geologic age Silurian
Lithologic constituents
Major
Sedimentary > Clastic > Mudstone > ShaleAA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Sedimentary > Clastic > SandstoneAA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Incidental
Metamorphic > Metasedimentary (Greenschist, Amphibolite)AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Sedimentary > Carbonate > LimestoneAA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Metamorphic > Schist (Greenschist, Amphibolite)AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Metamorphic > Metasedimentary > Calc-silicate-rock (Greenschist, Amphibolite)AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Metamorphic > Granoblastic > Granofels (Greenschist, Amphibolite)AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Sedimentary > Clastic > ConglomerateAA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; GS - Greenschist facies; E - Epidote-amphibolite facies; Protolith R - Interbedded pelite and limestone and/or dolostone
Comments In western sequence of central Maine trough, divided into a main body, lower member near Woodstock (schist and granofels probably equivalent to member B), upper member near Woodstock (schist and granofels probably equivalent to member C), member A (in turn divided into gray shale and massive sandstone facies, massive sandstone facies, and polymict conglomerate facies), member B (in turn divided into quartz-rich, polymictic conglomerate facies and gray shale and sandstone facies), and member C (in turn divided into quartz conglomerate, sandstone, and gray shale; impure limestone and quartz conglomerate lenses; and upper gray shale and sandstone). (ME004) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; 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.

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.

https://pubs.er.usgs.gov/publication/i1898D

Berry, W.B.N., pers. communication, 1983.

Osberg, P.H., 1968, Stratigraphy, structural geology, and metamorphism of the Watervill-Vassalboro area, Maine: Maine Geol. Surv., Bull. 20, 64 p.

Pankiwskyj, K.A., Ludman, A., Griffin, J.R., and Berry, W.B.N., 1976, Stratigraphic relationships on the southeast limb of the Merrimack synclinorium in central and eastern Maine: Geol. Soc. Amer., Memoir 146, p. 263-280.

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

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