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  • Usage in publication:
    • Irontown member
  • Modifications:
    • Named
  • Dominant lithology:
    • Fanglomerate
  • AAPG geologic province:
    • Great Basin province
Publication:

Mackin, J.H., 1960, Structural significance of Tertiary volcanic rocks in southwestern Utah: American Journal of Science, v. 258, no. 2, p. 81-131.


Summary:

Named as the basal member of the Page Ranch formation, a unit known in the Page Ranch quad, Washington and Iron Cos, UT in the Great Basin province. Old Irontown Historic Site occurs in the Page Ranch quad. Source of geographic name and type locality not stated. Consists of scarp-forming, crudely bedded fanglomerate of subangular blocks of Harmony Hills tuff [member] and other Quichapa ignimbrites. Thickness not stated. Underlain by the Rencher formation. Overlain by newly named Kane Point tuff member of Page Ranch. Oligocene-Miocene 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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