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Geologic Unit: Ionia
Map showing publication footprint
  • Usage in publication:
    • Ionia sandstone
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Michigan basin
Publication:

Kelly, W.A., 1936, The Pennsylvanian System of Michigan, IN Occasional papers on the geology of Michigan: Michigan Geological Survey Publication, no. 40, pt. 2, p. 149-226., Also issued as Michigan Geol. Survey Geol. Ser., no. 34


Summary:

Pg. 207. Name applied to cross-bedded, coarse-grained, varicolored sandstones outcropping in Grand River Valley near Ionia. Overlies shales and micaceous sandstones of Saginaw group. Included in newly proposed Grand River group. Stratigraphic relations to Eaton sandstone (new) not determined. Age is Pennsylvanian.
Type locality not stated. Probably named from exposures in abandoned quarries near Grand River between Lyons and Ionia, Ionia Co., southern MI.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1876).


Map showing publication footprint
  • Usage in publication:
    • Ionia sandstone member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Michigan basin
Publication:

Cohee, G.V., Macha, Carol, and Holk, Margery, 1951, Thickness and lithology of Upper Devonian and Carboniferous rocks in Michigan: U.S. Geological Survey Oil and Gas Investigations Chart, OC-41, scale 1:495,000


Summary:

Sheet 5. Recommended that Ionia sandstone be considered a member in Saginaw formation.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1876).


Map showing publication footprint
  • Usage in publication:
    • Ionia sandstone member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Michigan basin
Publication:

Michigan Geological Society, 1954, [Grand River area, Michigan], IN AAPG Geologic Names and Correlations Committee, Dott, R.H. and Murray, G.E., eds., Geologic cross section of Paleozoic rocks; central Mississippi to northern Michigan: American Association of Petroleum Geologists, 32 p.


Summary:

Pg. 28, 29. Herein considered member of Grand formation. It is probable that future study will show that the Eaton is a brown-weathering facies of Ionia as exact stratigraphic position of Eaton and Ionia members in the Grand River is not known. No paleontological evidence available to establish age of Ionia.

Source: US geologic names lexicon (USGS Bull. 1200, p. 1876).


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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