Usage:
Midale subinterval (informal) of Ratcliffe interval (informal) in Charles Formation of Madison Group (ND-subsurface)
Informal. The rank or lithologic term should not be capitalized.
Geologic age:
Middle Mississippian (Visean; late Osagean)
Type section, locality, area and/or origin of name: (See Canadian Lexicon)
Named from Midvale oil field, southeastern Saskatchewan, Canada (Fuller, 1956).
[Reference section? (subsurface)]: depth-interval 4,572 to 4,648 ft, Shell Oil Company Midale A-7-18 well, LSD 7-18-6-10, West of 2nd Meridian (W2M), Saskatchewan, Canada (Saskatchewan Geological Society, 1956).
AAPG geologic province:
Williston 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 ([ ]).