Usage:
Saverton Shale (IL*,MO*)
Saverton Shale Member of New Albany Shale of Knobs Group (IL-southern part)
Saverton Shale Member of New Albany Shale (IL-northern part)
Saverton Member of New Albany Shale (KY)
Saverton Member of Maple Mill Formation of Yellow Spring Group (IA)
Geologic age:
Late Devonian (Famennian)*
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 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 ([ ]).