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Geologic Unit: Alden
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  • Usage in publication:
    • Alden limestone
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Iowa shelf
Publication:

Van Tuyl, F.M., 1925, The stratigraphy of the Mississippian formations of Iowa, IN Kay, G.F., and Lees, J.H., Annual reports, 1921 and 1922, with accompanying papers: Iowa Geological Survey Annual Report, v. 30, p. 33-349.


Summary:

Pg. 52, 92, 99. Alden limestone. Light-gray, thin-bedded, slightly oolitic limestone, 30 feet thick. Overlies Iowa Falls dolomite, with evidence of disconformity. Fossils poorly preserved, and exact age open to question. [Age is Mississippian.] Tentatively referred to top of Kinderhook.
Named from exposures in south bank of Iowa River, just below wagon bridge at town of Alden, Hardin Co., IA.

Source: US geologic names lexicon (USGS Bull. 896, p. 28).


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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