Usage:
Leo Formation (SD)
Leo Sandstone Member of Minnelusa Formation (WY)
Geologic age:
Pennsylvanian, Middle
Pennsylvanian, Late
Type section, locality, area and/or origin of name:
Not designated. Named from Ohio Oil Company Leo No. 1 well, in NW/4 SE/4 sec. 35, T. 36 N., R. 65 W., Niobrara Co., WY (Hunt, 1938).
AAPG geologic province:
Powder River basin
Chadron arch
Denver basin
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 ([ ]).