Usage:
Calvert Ash Bed of Ogallala Formation (KS-recognized locally in Norton Co.)
Called Calvert Mine Ash Bed in some recent reports.
Geologic age:
late Tertiary (Miocene)
Type section, locality, area and/or origin of name:
Named from exposures in pit of Wyandotte Chemicals Corp., at Calvert, northeastern Norton Co., northwestern KS (Carey and others, 1952).
AAPG geologic province:
Central Kansas 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 ([ ]).