Silurian Hardwood Mountain Formation (MEShm;0)

State	Maine
Name	Silurian Hardwood Mountain Formation
Geologic age	Silurian
Original map label	Shm
Comments	Mapped in Bronson Hill-Boundary Mountains anticlinorium. Includes mudstone, siltstone, calcareous slate, minor but conspicuous limestone conglomerate, and sparse limestone and medium-grained sandstone. Complex shelly fauna as well as ostracodes and trilobites were found at several localities in Spencer Lake 15-min quad. (ME004) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies Protolith S - Calcareous pelite
Primary rock type	mudstone
Secondary rock type	siltstone
Other rock types	slate, conglomerate, limestone, sandstone
Lithologic constituents	Minor Sedimentary > Clastic > ConglomerateGS - Greenschist facies Protolith S - Calcareous pelite Sedimentary > Clastic > SiltstoneGS - Greenschist facies Protolith S - Calcareous pelite Sedimentary > Clastic > MudstoneGS - Greenschist facies Protolith S - Calcareous pelite Metamorphic > Metasedimentary > Metaclastic > SlateGS - Greenschist facies Protolith S - Calcareous pelite Incidental Sedimentary > Clastic > SandstoneGS - Greenschist facies Protolith S - Calcareous pelite Sedimentary > Carbonate > LimestoneGS - Greenschist facies Protolith S - Calcareous pelite
Map references	Digital bedrock data downloaded from Maine Office of GIS in September 2005 from http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock 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. [http://apollo.ogis.state.me.us/catalog/catalog.asp?state=2&extent=cover#bedrock]
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. Boucot, A.J., 1961, Stratigraphy of the Moose River synclinorium, IN Contributions to general geology, 1959: U.S. Geological Survey Bulletin, 1111-E, p. E153-E188. [http://pubs.er.usgs.gov/publication/b1111E] 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. [http://pubs.er.usgs.gov/publication/i1898D] Boucot, A.J., 1969, Geology of the Moose River and Roach River synclinoria, northwestern Maine: Maine Geol. Surv., Bull. 21, 123 p. USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Franklin - Somerset