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Map showing publication footprint
  • Usage in publication:
    • Fern Creek formation*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Lake Superior region
Publication:

James, H.L., 1958, Stratigraphy of pre-Keweenawan rocks in parts of northern Michigan, IN Shorter contributions to general geology, 1957: U.S. Geological Survey Professional Paper, 314-C, p. C27-C44. [Available online from the USGS PubsWarehouse: http://pubs.er.usgs.gov/pubs/pp/pp314C]


Summary:

Pg. 35. Fern Creek formation. Revised to basal formation of Chocolay group (new) of Animikie series. Unconformably overlies pre-Animikie crystalline rocks and locally underlies Sturgeon quartzite. Age is middle Precambrian (Animikie Series). Report includes stratigraphic sequence chart.

Source: Publication; US geologic names lexicon (USGS Bull. 1200, p. 1339).


Map showing publication footprint
  • Usage in publication:
    • Fern Creek Formation*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Lake Superior region
Publication:

Cannon, W.F., and Gair, J.E., 1970, A revision of stratigraphic nomenclature for middle Precambrian rocks in northern Michigan, IN Note and Discussion: Geological Society of America Bulletin, v. 81, no. 9, p. 2843-2846.


Summary:

Pg. 2845 (fig. 2, stratigraphic chart compiled from Leith and others, 1935; James, 1958; Gair and Thaden, 1968). Fern Creek Formation of Chocolay Group of Marquette Range Supergroup (new; replaces †Animikie series of James, 1958, south of Lake Superior, in Michigan and Wisconsin). Present in Menominee Range, northwestern Michigan. Underlies Sturgeon Quartzite of Chocolay Group; unconformably overlies lower Precambrian gneiss. Age is middle Precambrian.

Source: Publication.


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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