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Occurrence of the Upper Cretaceous ammonite Rhaeboceras in the Baculites eliasi Zone of the Pierre Shale
Published online by Cambridge University Press: 14 July 2015
Extract
The discovery of a specimen of Rhaeboceras coloradoense Cobban, 1987, in the Baculites eliasi zone in east-central Montana is significant for three reasons: 1) it is the most geologically recent occurrence of Rhaeboceras; 2) it connects more closely than previous specimens the lineage between the genus Rhaeboceras Meek and Ponteixites Warren, its apparent smaller descendant; and 3) it significantly extends the geographical range of the species.
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