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Geologic Unit: Sappa
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Map showing publication footprint
  • Usage in publication:
    • Sappa Formation*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Salina basin
Publication:

Izett, G.A., and Wilcox, R.E., 1982, Map showing localities and inferred distributions of the Huckleberry Ridge, Mesa Falls, and Lava Creek ash beds (Pearlette family ash beds) of Pleistocene age in the western United States and southern Canada: U.S. Geological Survey Miscellaneous Investigations Series Map, I-1325, 1 sheet, scale 1:4,000,000


Summary:

Use of Pearlette as a member of Sappa Formation abandoned. Type Sappa in the Salina basin, NE contains only Pearlette type O, or Mesa Falls ash bed, the informally designated downwind equivalent of the Mesa Falls Tuff of the Yellowstone caldera complex.

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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