Silurian Smalls Falls Formation (MESsf;0)

State	Maine
Name	Silurian Smalls Falls Formation
Geologic age	Silurian
Original map label	Ssf
Comments	Divided into lower interbedded sulfidic shale and sandstone member, 600 m thick; upper calc-silicate member; 150 m thick; a grit member present locally. Thins to north and southeast. Also has been mapped in NH. Replaces use of Parkman Hill Formation, here abandoned. (ME041) Unit description from USGS GEOLEX website (ME078). AC - High rank amphibolite facies Protolith C - Sulfidic/carbonaceous pelite
Primary rock type	shale
Secondary rock type	sandstone
Other rock types	calc-silicate rock
Lithologic constituents	Major Sedimentary > Clastic > SandstoneAC - High rank amphibolite facies Protolith C - Sulfidic/carbonaceous pelite Sedimentary > Clastic > Mudstone > ShaleAC - High rank amphibolite facies Protolith C - Sulfidic/carbonaceous pelite Minor Metamorphic > Metasedimentary > Calc-silicate-rockAC - High rank amphibolite facies Protolith C - Sulfidic/carbonaceous 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. Moench, R.H. and Pankiwskyj, K.A., 1988, Geologic map of western interior Maine: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1692, 21 p., 1 sheet, scale 1:250,000. [http://pubs.er.usgs.gov/publication/i1692] USGS Geologic Names Lexicon (GEOLEX) [http://ngmdb.usgs.gov/Geolex/]
Geographic coverage	Franklin - Kennebec - Oxford - Penobscot - Piscataquis - Somerset