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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).