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Geologic Unit: Puritan
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Map showing publication footprint
  • Usage in publication:
    • Puritan Quartz Monzonite*
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Quartz monzonite
  • AAPG geologic province:
    • Lake Superior region
Publication:

Schmidt, R.G., 1976, Geology of the Precambrian W (lower Precambrian) rocks in western Gogebic County, Michigan: U.S. Geological Survey Bulletin, 1407, 40 p., (incl. geologic map, scale 1:48,000)


Summary:

Pg. 14-18, pl. 1 (geol. map). Puritan Quartz Monzonite. An intrusive igneous body in the Puritan-Van Buskirk pluton. Is a mostly pale pinkish gray, medium- to coarse-grained, porphyritic quartz monzonite; is generally homogenous in both texture and composition. Consists of plagioclase, quartz, and microcline, and small amounts of chlorite, biotite, muscovite, and epidote. Intrudes Ramsay Formation and Whiskers Creek Gneiss (both new). Locally cut by dikes of Sunset Creek Intrusive Complex (new). Grades into Van Buskirk Gneiss (new). Age is early Precambrian (Precambrian W); [late Archean].
[Type locality]: extensive exposures near the site of the old Puritan Mine, south of community of Puritan, in SW/4 sec. 17 and NW/4 sec. 20, T. 47 N., R. 46 W., [Bessemer 7.5-min quadrangle], western Gogebic Co., Northern Peninsula, northwestern MI.

Source: Publication; US geologic names lexicon (USGS Bull. 1564, p. 136); ; Changes in stratigraphic nomenclature, 1976 (USGS Bull. 1435-A, p. A85-A86).


Map showing publication footprint
  • Usage in publication:
    • Puritan Quartz Monzonite*
  • Modifications:
    • Geochronologic dating
  • AAPG geologic province:
    • Lake Superior region
Publication:

Sims, P.K., Peterman, Z.E., Prinz, W.C., and Benedict, F.C., 1984, Geology, geochemistry, and age of Archean and Early Proterozoic rocks in the Marenisco-Watersmeet area, northern Michigan, IN Contributions to the geology of the Lake Superior region: U.S. Geological Survey Professional Paper, 1292-A-B, 54 p.


Summary:

Pg. A20. Puritan Quartz Monzonite. Rb-Sr isochron method indicates age of 2,650 +/-140 Ma (Late Archean), citing Sims and others, 1977 (USGS Jour. Research, v. 5, p. 185-192).

Source: Publication.


Map showing publication footprint
  • Usage in publication:
    • Puritan Quartz Monzonite*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Wisconsin arch
Publication:

Cannon, W.F., Woodruff, L.G., Nicholson, S.W., and Hedgman, C.A., 1996, Bedrock geologic map of the Ashland and northern part of the Ironwood 30' x 60' quadrangles, Wisconsin and Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2566, 1 sheet, scale 1:100,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_13052.htm]


Summary:

Puritan Quartz Monzonite extended from MI into WI.

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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