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  • Usage in publication:
    • Garden Island formation
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolomite
    • Limestone
  • 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 Garden Island formation for Garden Island, northeastern MI. Consists of dolomite and dolomitic limestone which occupies a position between Silurian St. Ignace formation and Middle Devonian Bois Blanc formation. Thickness at type locality is 3 feet; maximum thickness probably not more than 25 feet, and average thickness not more than 15 feet. The Garden Island is of Early Devonian 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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