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National Geologic Map Database

Geologic Unit: Picard

Usage:

Picard Shale Member of Nesson Formation (MT*,ND*)
Picard Member of Piper Formation (ND)


Geologic age:

Jurassic, Early(?)*
Jurassic, Middle*


Type section, locality, area and/or origin of name:

Type section (subsurface): depth-interval 6,610 to 6,650 ft, Deep Rock Oil Corp. No. 1 Picard Well, in center NW/4 NE/4 sec. 6, T. 29 N., R. 58 E., Roosevelt Co., MT. Presumably named from Picard Well (Nordquist, 1955).


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 ([ ]).