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Geologic Unit: Rangely
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Map showing publication footprint
  • Usage in publication:
    • Rangely tongue
  • Modifications:
    • First used
  • Dominant lithology:
    • Shale
  • AAPG geologic province:
    • Piceance basin
Publication:

Hale, L.A., 1955, Stratigraphy and facies relationship of the Montanan group in south-central Wyoming, northeastern Utah, and northwestern Colorado, IN Anderman, G.G., and others, eds., Green River basin: Wyoming Geological Association Field Conference Guidebook, no. 10, p. 89-94.


Summary:

First used as tongue of Mancos shale of Montana group in vicinity of Rangely, Rio Blanco Co, CO in Piceance basin. Type locality not designated. Derivation of name not stated. Shown on correlation chart (fig. 3) of Montana group. Overlies Rim Rock sandstone. Underlies Williams Fork formation. Thickness not stated. Lithology is shale. Is considered equivalent to Black Butte tongue (reassigned) of Mancos; and correlated with the basal marine section of the Mesaverde at Deep Creek and with the Upper Mancos at Meeker, CO. Is medial Montanan (Late Cretaceous) age. [Is probably the same as Buck Tongue of the Mancos Shale as recognized in the Rangely oil field.]

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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