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National Geologic Map Database

Geologic Unit: Jordan

Usage:

Jordan Sandstone (IL*,IA*,MN*,MO*,WI*)
Jordan Sandstone of Trempealeau Group (WI*)
Jordan Sandstone Member of Trempealeau Formation (IA*,MI*,WI*)


Subunits:

FORMATION STATUS (alphabetical): Norwalk Member (IA,WI*,MN*), Sunset Point Member (WI), Waukon Member (IA,WI), and Van Oser Member (IA,WI*,MN*).


Geologic age:

Late Cambrian*


Type section, locality, area and/or origin of name:

Named from exposures in Sand Creek at Jordan, Scott Co., MN (Winchell, 1872).


AAPG geologic province:

Iowa shelf*
Lincoln anticline*
Michigan basin*
Sioux uplift*
Wisconsin arch*


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 ([ ]).