Usage:
Dutchtown Formation (MO*,IL*)
Dutchtown Formation of Ancell Group (IN)
Dutchtown Limestone (AR,MO)
Dutchtown Limestone of Ancell Group (IL)
Subunits:
Geiser Quarry Member (MO), Sharpsboro Member (IL), Gordonville Member (IL).
Geologic age:
Late Ordovician (Mohawkian)*
Type section, locality, area and/or origin of name:
Type section: in a bluff 1 mi east of Dutchtown, Cape Girardeau Co., eastern MO (McQueen, 1937; Willman and others, 1975).
AAPG geologic province:
Illinois basin*
Ozark uplift*
Upper Mississippi embayment*
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 ([ ]).