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Devonian Tarratine Formation

Devonian Tarratine Formation
StateMaine
NameDevonian Tarratine Formation
Geologic ageDevonian
Original map labelDt
CommentsNamed as a formation in Moose River Group after Tarratine railroad stop in Brassua Lake 15-min quad, west-central ME. Type section is along right-of-way of Canadian Pacific Railroad between Tarratine, on west side of Misery Ridge, and Somerset Junction on east side of ridge. Occurs in northern Somerset and western Piscataquis Cos., ME. Thick beds form cliffs bordering Enchanted Pond and slopes of Hedgehog Mountain in Spencer Lake 15-min quad. Consists mainly of blue-gray, dark-brown-weathering, well-indurated sandstone; some thin beds of dark-gray, gray- to dark-brown-weathering slate; and black, rusty- or gray- to dark-gray-weathering siltstone. Also contains Misery quartzite member (new) and McKenney Ponds limestone member (new). Maximum thickness is 10,000 ft. Lower contact of main body is gradational in one place and sharply disconformable in other places with the McKenney Ponds limestone member. Lower contact with Seboomook formation is gradational; conformably underlies Kineo volcanic member of Tomhegan formation. Report includes geologic map and correlation chart. (ME003) Unit description from USGS GEOLEX website (ME078). GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite Protolith E - Feldspathic sandstone
Primary rock typesandstone
Secondary rock typeslate
Other rock typessiltstone; limestone; quartzite
Lithologic constituents
Major
Sedimentary > Clastic > SandstoneProtolith E - Feldspathic sandstone GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite
Minor
Metamorphic > Metasedimentary > Metaclastic > QuartziteProtolith E - Feldspathic sandstone GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite
Metamorphic > Metasedimentary > Metaclastic > SlateProtolith E - Feldspathic sandstone GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite
Sedimentary > Carbonate > LimestoneProtolith E - Feldspathic sandstone GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite
Sedimentary > Clastic > SiltstoneProtolith E - Feldspathic sandstone GS - Greenschist facies W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite
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.
USGS Geologic Names Lexicon (GEOLEX)
Geographic coveragePiscataquis - Somerset

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