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Geologic Unit: Attean
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Map showing publication footprint
  • Usage in publication:
    • Attean Quartz Monzonite*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Quartz monzonite
  • AAPG geologic province:
    • Appalachian basin
Publication:

Albee, A.L., and Boudette, E.L., 1972, Geology of the Attean quadrangle, Somerset County, Maine, with a section on geologic interpretation of the aeromagnetic map by J.W. Allingham and A.L. Albee: U.S. Geological Survey Bulletin, 1297, 110 p., (incl. geologic map, scale 1:62,500)


Summary:

Pg. 21-28. Attean Quartz Monzonite. Pink and green porphyritic quartz monzonite with large K-feldspar phenocrysts. Intrudes granofels and diorite; intruded by Ordovician or younger rocks; unconformably underlies Upper Silurian metasedimentary rocks. Age is Early Ordovician.
Type locality: along line trending S. 70 deg. W. from unnamed islands in southwest part of Attean Pond to summit of Attean Mountain, Attean quadrangle, Somerset Co., west-central ME. Named for Attean Pond and Attean Mountain in Attean Twp.

Source: US geologic names lexicon (USGS Bull. 1520, p. 14).


Map showing publication footprint
  • Usage in publication:
    • Attean Quartz Monzonite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • New England province
Publication:

Marvin, R.F., and Dobson, S.W., 1979, U.S. Geological Survey radiometric ages; Compilation "B": Isochron/West, no. 26, p. 3-32.


Summary:

Pg. 17, geologic time scale (inside front cover). Attean Quartz Monzonite (Late Ordovician). Gangue muscovite sample from vein cutting Attean Quartz Monzonite, at Lat. 45 deg. 32 min. 00 sec. N., Long. 70 deg. 13 min. 00 sec. W., Long Pond quadrangle, Somerset County, Maine, yielded a Rb-Sr age of 448 +/-20 Ma (muscovite) and a K-Ar age of 440 +/-14 Ma (muscovite) [close to Ordovician-Silurian boundary (440-430 Ma)]. Cady (1969) published age of 433 Ma for this sample; ages recalculated using decay constants of Steiger and Jager, 1977 (Earth Planet. Sci. Letters, v. 36, p. 359-362).

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Attean Quartz Monzonite*
  • Modifications:
    • Revised
    • Age modified
  • AAPG geologic province:
    • New England province
Publication:

Lyons, J.B., Aleinikoff, J.N., and Zartman, R.E., 1986, Uranium-thorium-lead age of the Highlandcroft Plutonic Suite, northern New England: American Journal of Science, v. 286, no. 6, p. 489-509.


Summary:

Eight stocks in northern New Hampshire and west-central Maine are now assigned to the Highlandcroft Plutonic Suite, including the Attean Quartz Monzonite. Isotopic age of the Attean is 443+/-4 Ma, modifying the age of this unit to Late Ordovician.

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


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For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

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