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National Geologic Map Database

Geologic Unit: Dutchtown

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 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 ([ ]).