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  • Usage in publication:
    • Ft. Defiance Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Siltstone
    • Sandstone
  • AAPG geologic province:
    • Black Mesa basin
Publication:

Pierce, W.G., 1964, Internal correlation of the Permian DeChelly Sandstone-Defiance Plateau, Arizona; contributions to the geology of northern Arizona: Museum of Northern Arizona Bulletin, no. 40, p. 15-32.


Summary:

Named as the upper member (of five) of De Chelly [sic] Sandstone for outcrops in Bonito Canyon near Ft. Defiance, its type section, Apache Co, AZ in the Black Mesa basin. Is 106 feet thick at Bonito Canyon. Of limited areal extent. Overlies Black Creek Member (new) of De Chelly. Underlies Triassic rocks. Consists of slope-forming, flat-bedded, water-deposited siltstones and sandstones. Permian age.

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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