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Map showing publication footprint
  • Usage in publication:
    • Lobster Mountain Volcanics*
  • Modifications:
    • Age modified
    • Biostratigraphic dating
  • AAPG geologic province:
    • New England province
Publication:

Neuman, R.B., 1973, Late Ordovician (Ashgillian) age of volcanic rocks, north-central Maine, IN Geological Survey Research 1973: U.S. Geological Survey Professional Paper, 850, p. 165.


Summary:

Ashgillian (Late Ordovician) of flinty rhyolitic tuff and tuffaceous conglomerate of Lobster Mountain Volcanics in Piscataquis Co., ME, is determined from brachiopod assemblage. Brachiopods include genera CATAZYGA, aff. DOLOROIDES, GLYPTORTHIS, LEANGELLA, and SOWERBYELLA.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Lobster Mountain Volcanics*
  • Modifications:
    • Age modified
    • Overview
  • AAPG geologic province:
    • New England province
Publication:

Moench, R.H., Boone, G.M., Bothner, W.A., Boudette, E.L., Hatch, N.L., Jr., Hussey, A.M., II, 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, 2 sheets, 56 p., scale 1:250,000, Prepared in cooperation with Maine and New Hampshire geol. surveys


Summary:

Mapped as Lobster Mountain Volcanics(?) because of tentative correlation with Lobster Mountain Volcanics mapped by Boucot and Heath (1969). Small bodies are located at Grace Pond (massive porphyry) and Johns Pond (volcaniclastic metasiltstone, metasandstone, andesitic volcanic rocks, volcanic breccia, and conglomerate) in Pierce Pond 15-min quad, and northwest of Spencer Mountain in Spencer Stream 15-min quad (tuff). Neuman (1973) dated these rocks as Late Ordovician (Ashgillian) based on a brachiopod assemblage. Age is here stated as Ordovician (Cincinnatian) following time scale of Ross and others (1982, with modifications by Ross, 1992, written commun.)

Source: GNU records (USGS DDS-6; Reston GNULEX).


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