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Geologic Units: Yampai
Map showing publication footprint
  • Usage in publication:
    • Yampai sandstones
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Plateau sedimentary province
Publication:

Keyes, C.R., 1922, Framework of Arizona geology: Pan-American Geologist, v. 38, no. 3, p. 231-252., See also "Deliminations of sundry Arizona terranes," Pan-Amer. Geol., v. 38, no. 4, p. 335-339, 1922


Summary:

Pg. 251, 339. Yampai sandstones is proposed for the red friable sandstone particularly distinguishing the middle section of Supaian series and outcropping in Yampai Cliffs, or southern extension of Grand Wash Cliffs, in northwestern Arizona. Thickness 300 feet. Age is Permian.

Source: US geologic names lexicon (USGS Bull. 896, p. 2381).


Map showing publication footprint
  • Usage in publication:
    • Yampai shales
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Plateau sedimentary province
Publication:

Keyes, C.R., 1936, Geological age of rim rocks of the Grand Canyon [Arizona]: Pan-American Geologist, v. 66, no. 3, p. 195-216.


Summary:

Pg. 215 (table). Yampai shales in Tusayan series (new) of Carbonic age. Underlies Shiwits sandstones; overlies Seligman limestones. Age is Permian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 4316).


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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