Heteromorph ammonites from the middle Campanian Baculites scotti Zone in the U.S. Western Interior

Authors

  • William James Kennedy Geological Collections, Oxford University Museum of Natural History, Oxford OX1 3PW
  • Wiiliam A. Cobban 70 Estes Street, Lakewood, Colorado 80226
  • Glenn R. Scott 60 Estes Street, Lakewood, Colorado 80226

Keywords:

Cretaceous, Campanian, U.S. Western Interior, Ammonites, Biostratigraphy

Abstract

Heteromorph ammonites are common in the middle Campanian Baculites scotti Zone of the United States Western Interior; the following species are described: Didymoceras binodosum (KENNEDY & COBBAN, 1993a), D. wrighti sp. nov., D. jorgenseni sp. nov., Anaklinoceras incertum sp. nov., Lewyites sulcatus sp. nov., Solenoceras mortoni (MEEK & HAYDEN, 1857), and Spiroxybeloceras kimbroense KENNEDY & COBBAN, 1999. They provide the basis for the subdivision of the scotti Zone into a lower Didymoceras binodosum Subzone, and an upper Didymoceras jorgenseni Subzone.

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Issue

Vol. 50 No. 2 (2000)

Section

Articles