Stratigraphic distribution of Middle Triassic ammonites at Fossil Hill, Humboldt Range, Nevada

Stratigraphically controlled collections from upper Anisian (middle Middle Triassic) strata at Fossil Hill in the Humboldt Range, show 1) that nearly a dozen successive ammonite faunas are present, and 2) that many of the previously described species are variants of conspecific morphologically variable populations. In this advance summary the taxonomic revision and stratigraphic distribution of 37 species, which incorporate 92 of the species recorded from these strata by J. P. Smith, is presented in tabular form.

This record provided courtesy of AGI/GeoRef.

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				D. T. Donovan, F. Hodson, M. K. Howarth, M. R. House, E. T. Tozer, and C. W. Wright Chapter 15 Mollusca: Cephalopoda (Ammonoidea) Geological Society, London, Special Publications, January 1, 1967; 2(1): 445 - 460. [Abstract] [PDF]