| Summary: | 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 and COBBAN, 1993a), D. wrighti sp. nov., D. jorgenseni sp. nov., Anaklinoceras incertum sp. nov., Lewyites sulcatus sp. nov., Solenoceras mortoni (MEEK and HAYDEN, 1857), and Spiroxybeloceras kimbroense KENNEDY and 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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