Devonian Littleton Formation

Devonian Littleton Formation
State Maine
Name Devonian Littleton Formation
Geologic age Devonian
Lithologic constituents
Major
Metamorphic > Schist (Amphibolite)AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith Q - Interbedded pelite and sandstone
Minor
Metamorphic > Metasedimentary > Metaclastic > Metasiltstone (Amphibolite)AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith Q - Interbedded pelite and sandstone
Metamorphic > Gneiss (Amphibolite)AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith Q - Interbedded pelite and sandstone
Metamorphic > Metasedimentary > Metaclastic > Metasandstone (Amphibolite)AB - Medium rank amphibolite facies; AC - High rank amphibolite facies; Protolith Q - Interbedded pelite and sandstone
Comments Ironbound Mountain Formation exposed in two major belts within and beyond Penobscot Lake region. Two minor strike belts are thrust faulted and contained within the region. Southeastern major belt is partly mapped into areas previously identified as Seboomook Formation. Northwestern belt is underlain entirely by the Grenier Ponds Member. Most characteristic lithology of the Ironbound Mountain is thinly bedded, well-cleaved, medium- to dark gray mudstone and siltstone slate. Beds range from 1 to 30 cm. Locally contains minor beds of matrix-supported conglomerate. Stratigraphically underlies North East [Northeast] Carry Formation. Unit may span the Silurian-Devonian boundary and range from possibly latest Pridolian to earliest Gedinnian. (ME011) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies; W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith A - Pelite.
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

Billings, M.P., and Cleaves, A.P., 1934, Paleontology of the Littleton area, New Hampshire: Am. Jour. Sci., v. 28, 5th ser., p. 412-438.

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

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Counties Oxford