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Geologic Unit: Picard
Map showing publication footprint
  • Usage in publication:
    • Picard shale member
  • Modifications:
    • Named
  • Dominant lithology:
    • Shale
    • Gypsum
  • AAPG geologic province:
    • Williston basin
Publication:

Nordquist, J.W., 1955, Pre-Rierdon Jurassic stratigraphy in northern Montana and Williston basin, IN Lewis, P.J., ed., Sweetgrass arch-Disturbed belt, Montana: Billings Geological Society Guidebook, September 7-9, 1955, no. 6, p. 96-106.


Summary:

Named as middle member of Nesson Formation. Type section is interval 6,610 to 6,650 ft in Deep Rock Oil Corp. No. 1 Picard well, center NW1/4 NE1/4 sec 6, T29N, R52E, Roosevelt Co, MT in Williston basin. Shale unit that conformably overlies Poe evaporite member (new) and underlies Kline member (new). In type section, consists of 40 ft of dark-red shale which is slightly silty in part and contains masses or thin interbeds of white, earthy gypsum in lower half of unit. Thins laterally towards margins of Williston basin. Member has no known surface exposures and is believed to be confined to the subsurface of the Williston basin, pinching out by non-deposition on the flanks of the basin. Assigned to the Early? or Middle Jurassic.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Picard Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Williston basin
Publication:

Bluemle, J.P., Anderson, S.B., and Carlson, C.G., 1980, North Dakota stratigraphic column: North Dakota Geological Survey, 1 sheet., Chart included with North Dakota Geol. Survey Rpt. Inv., no. 71


Summary:

Made a member of Piper Formation (revised) in western ND, Williston basin. Overlain by Kline Member; underlain by Poe Member, both of Piper Formation (revised). Is Jurassic in age.

Source: GNU records (USGS DDS-6; Denver GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Picard Shale Member*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Williston basin
Publication:

Imlay, R.W., 1980, Jurassic paleobiogeography of the conterminous United States in its continental setting: U.S. Geological Survey Professional Paper, 1062, 134 p.


Summary:

Is a member of Nesson Formation. Is Middle Jurassic (Bajocian) in age. Is in central and eastern MT and western ND, Williston basin. Summarizes the lithology, basis for dating, distribution, and correlation.

Source: GNU records (USGS DDS-6; Denver GNULEX).


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 ([ ]).

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