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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • White Point Sandstone Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
    • Siltstone
    • Grit
  • AAPG geologic province:
    • Paradox basin
Publication:

Thompson, A.E., and Stokes, W.L., 1970, Stratigraphy of the San Rafael Group, southwest and south central Utah: Utah Geological and Mineral Survey Bulletin, no. 87, 53 p.


Summary:

Named as a member of the Summerville Formation of San Rafael Group for White Point a prominent topographic salient extending east from Straight Cliffs, 19 mi south of Escalante, Garfield Co, UT in Paradox basin. Type section measured in north-central sec 5, T38S, R5E. Composed of yellow-gray, fine- to medium grained, poorly sorted, angular to subangular, calcareous, resistant sandstone, red brown calcareous siltstone, and pink-gray, poorly sorted subangular to subrounded, friable, calcareous gritstone. Sandstone at base of member is friable and easily weathered. Is 83+ ft thick at type where it overlies Entrada Sandstone and underlies Morrison Formation. Has the same boundaries as the Summerville [may not be necessary a distinct name]. Was mapped previously as an undifferentiated part of Summerville, as part of Salt Wash Member of Morrison Formation, and as Bluff Sandstone. Is a marginal facies of the Summerville. Age not clearly stated [probably Late Jurassic]. Measured sections.

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


Map showing publication footprint
  • Usage in publication:
    • White Point Member
  • Modifications:
    • Not used
Publication:

Peterson, Fred, 1988, Stratigraphy and nomenclature of Middle and Upper Jurassic rocks, western Colorado Plateau, Utah and Arizona, IN Revisions to stratigraphic nomenclature of Jurassic and Cretaceous rocks of the Colorado Plateau: U.S. Geological Survey Bulletin, 1633-B, p. B13-56.


Summary:

Part of what is considered Tidwell Member (new) of Morrison Formation in this report was assigned by Thompson and Stokes (1970) to White Point Member of Summerville Formation in southeastern part of Kaiparowits basin, UT, Plateau sedimentary province. White Point was thought to be a southern extension of Summerville, actually contains a sequence of rocks that belong to the Morrison. Not recognized as a valid term in this report. [Age not discussed, but if member belongs in Morrison, it is Late Jurassic.]

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