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Devonian Seboomook Formation

Devonian Seboomook Formation
State Maine
Name Devonian Seboomook Formation
Geologic age Devonian
Comments Raised to group rank following the usage of Pollock (1987). In Piermont sequence of Piermont-Frontenac allochthon, contains newly defined Ironbound Mountain Formation (northwest of Thrasher Peaks and Foster Hill faults). Includes an upper unnamed shale and sandstone unit, greenstone at Camera Hill (previously mapped as Camera Hill Greenstone Member of Seboomook Formation by Boucot (1961)), and a lower well-bedded shale and sandstone unit in the Bronson Hill-Boundary Mountains anticlinorium. In central Maine trough, includes Day Mountain, Temple Stream, Mount Blue Formations (all three previously members of Seboomook Formation), and Hildreths and Carrabassett Formations. Type section of the Seboomook Formation (designated by Boucot (1961)) is now assigned to Northeast Carry Formation, also of Seboomook Group but is outside of this map area. (ME004) Unit description from USGS GEOLEX website (ME078). AB - Medium rank amphibolite facies AC - High rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith Q - Interbedded pelite and sandstone
Primary rock type mudstone
Secondary rock type sandstone
Other rock types
Lithologic constituents
Major
Sedimentary > Clastic > MudstoneAB - Medium rank amphibolite facies AC - High rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith Q - Interbedded pelite and sandstone
Sedimentary > Clastic > SandstoneAB - Medium rank amphibolite facies AC - High rank amphibolite facies E - Epidote-amphibolite facies GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith Q - Interbedded pelite and sandstone
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.
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.
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.
Boucot, A.J., 1969, Geology of the Moose River and Roach River synclinoria, northwestern Maine: Maine Geol. Surv., Bull. 21, 123 p.
Hall, B.A., 1970, Stratigraphy of the southern end of the Munsungun anticlinorium, Maine: Maine Geol. Surv., Bull. 22, 63 p.
St. Peter, C., and Boucot, A.J., 1981, Age and regional significance of brachiopods from the Temiscouata Formation of Madawaska County, New Brunswick: Maritime Seds. Atlantic Geol., v. 17, p. 88-95.
Fairbairn, H.W., pers. communication, in Boone, G.M., 1962.
USGS Geologic Names Lexicon (GEOLEX)
Counties Aroostook - Franklin - Oxford - Penobscot - Piscataquis - Somerset