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National Geologic Map Database

Geologic Unit: Midale

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).