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  • Usage in publication:
    • Pointe aux Chenes shale
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Dolomite
  • AAPG geologic province:
    • Michigan basin
Publication:

Ehlers, G.M., 1945, Stratigraphy of surface formations, IN Landes, K.K., and others, eds., Geology of the Mackinac Straits region and sub-surface geology of northern Southern Peninsula: Michigan Geological Survey Publication, no. 44, p. 21-120., Also issued as Michigan Geol. Survey Geol. Ser., no. 37


Summary:

Named the Pointe aux Chenes shale of the Salina group for Pointe aux Chenes, Mackinac Co., northern MI. Consists of green and red shale with thin beds of dolomite of varied lithologic character and small irregular masses and thin beds of gypsum. Thickness varies from 8 to as much as 35 feet in outcrop sections; well records show between 500 and 600 feet on St. Ignace Peninsula. Overlies Engadine dolomite and underlies St. Ignace formation. The Pointe aux Chenes is of Late Silurian age.

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


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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