Maquoketa Shale (IL*,IN,IA*,KY,MN*,MO*,WI*, and KS*-subsurface)
Maquoketa Formation (IA,MN,MO)
Maquoketa Group (IL*,IN,MO*,WI)
Maquoketa Shale Group (IL)
[?] Maquoketa Supergroup (OH)
SUPERGROUP STATUS --in OH: unknown [not recorded in GNU records (USGS DDS-6)].
GROUP STATUS (alphabetical): Brainard Formation (IL,IN?), Cape La Croix Shale (MO), Dillsboro Formation (IN), Fort Atkinson Limestone (IL,IN) or Fort Atkinson Formation (IL), Girardeau Limestone (IL*,MO*), Kope Formation (IN), Neda Formation (IL), Orchard Creek Shale (IL*,MO*), Scales Shale (IL,IN) or Scales Formation (IL), Thebes Sandstone (IL*,MO*), Whitewater Formation (IN).
FORMATION STATUS (alphabetical): Brainard Member (IL*,IA*,WI*), Clermont Shale Member (IA) or Clermont Member (MN), Elgin Limestone Member (IA) or Elgin Member (MN), Fort Atkinson Limestone Member (IA,WI) or Fort Atkinson Dolomite Member (WI), Neda Member (IA*,WI*), Scales Member (WI), Wykoff Member (IA,MN).
Named from exposures on Little Maquoketa River, 12 mi west of Dubuque, Dubuque Co., eastern IA (US geologic names lexicons, USGS Bull. 896, 1200).
Reference section: in roadcut on U.S. Interstate Highway I-55, in SE/4 sec. 19, T. 42 N., R. 6 E., Herculaneum 7.5-min quadrangle, eastern Jefferson Co., eastern MO (Thompson, 1991).
Upper Mississippi embayment*
Forest City basin*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.
"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).