National Geologic Map Database

Geologic Unit: Guttenberg


Guttenberg Limestone Member of Decorah Formation (IL*,IA*,MN*,WI*)
Guttenberg Limestone of Decorah Group (IL*,MO*)
Guttenberg Formation of Galena Group (IL,IA,WI)
Guttenberg Formation of /Decorah subgroup [informal] (IL)

["Subgroup" not recognized as a formal stratigraphic rank term (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). Decorah subgroup considered informal and should not be capitalized.]


(alphabetical) --all in IA,IL,WI: Garnavillo Member, Glenhaven Member.

Geologic age:

Late Ordovician (Mohawkian)*

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

Type section: in bluff of Mississippi River just northwest of town of Guttenberg, Clayton Co., northeastern IA (Kay, 1928).
Reference sections in MO (Thompson, 1991):
(1) Kings Lake section, in SE/4 SE/4 NE/4 sec. 26, T. 50 N., R. 2 E., Lincoln Co.;
(2) a quarry 2 mi north of New London, in NE/4 NW/4 sec. 36, T. 56 N., R. 5 W., New London 7.5-min quadrangle, Ralls Co.;
(3) roadcut on MO Highway 61 immediately north of bridge over Spencer Creek, in SE/4 SE/4 sec. 21, T. 55 N., R. 4 W., Hannibal 7.5-min quadrangle, Ralls Co.; and
(4) small quarry off gravel road 1 mi north of Pike-Lincoln Co. line, in SE/4 SE/4 SE/4 sec. 28, T. 52 N., R. 2 W., Eolia 7.5-min quadrangle, Pike Co.

AAPG geologic province:

Iowa shelf*
Illinois basin*
Lincoln anticline*
Ozark uplift*

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 ([ ]).