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National Geologic Map Database

Geologic Unit: Saverton

Usage:

Saverton Shale (MO*,IL*,KY)
Saverton Member of Maple Mill Formation of Yellow Spring Group (IA)
Saverton Shale Member of New Albany Shale of Knobs Group (IL)


Geologic age:

Late Devonian*


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

Type locality: Missouri River bluff several hundred ft above Champ Clark Bridge, the same as the type locality for the Grassy Creek (in approx. SW/4 NW/4 SE/4 sec. 18, T. 54 N., R. 1 W.), Pike Co., MO (Mehl, 1960).


AAPG geologic province:

Illinois basin*
Iowa shelf
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 ([ ]).