Silurian rocks of the Fivemile Brook sequence

Silurian rocks of the Fivemile Brook sequence
State Maine
Name Silurian rocks of the Fivemile Brook sequence
Geologic age Silurian
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > Phyllite (Zeolitic (prehnite-pumpellyite))W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith B - Calcareous pelite
Minor
Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith B - Calcareous pelite
Sedimentary > Carbonate > LimestoneW - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; Protolith B - Calcareous pelite
Comments Named for Capens in Moosehead Lake 15-min quad, western Piscataquis Co., western ME. Type section is between Capens and Lambert Island in northwest part of Deer Island. Occurs on Sugar Island, Deer Island, and adjacent mainland in Moosehead Lake area. Consists of fine-grained and well-indurated red and green slates interbedded with conglomerate consisting of quartz sand, fine-grained silt, and felsite, quartz, limestone, and slate pebbles. Thickness is 200 to 400 ft. Conformably overlies unnamed Silurian or Devonian rocks; disconformably underlies Whisky quartzite (new). (ME003) Unit description from USGS GEOLEX website (ME078). W - Weakly metamorphosed; contains local occurrences of prehnite and pumpellyite; GS - Greenschist facies; 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.

Boudette, E.L., Hatch, N.L., Jr., and Harwood, D.S., 1976, Reconnaissance geology of the Upper St. John and Allagash river basins, Maine: U.S. Geol. Surv., Bull. 1406, 37 p.

Roy, D.C. and Lowell, T.V., 1983, Bedrock and surficial geology of the upper St. John River area, northwestern Aroostook County, Maine; Field trip 5, IN Hussey, A.M., II, and Westerman, D.S., eds., Field trips of the Geological Society of Maine, 1978-1983: Maine Geology Bulletin, no. 3, p. 26-49.

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

NGMDB product
Counties Aroostook