Jaws and Radula of Baculites from the Upper Cretaceous (Campanian) of North America

  • Neil H. Landman
  • Neal L. Larson
  • William A. Cobban

The seminal discovery by Meek and Hayden (1865) of an aptychus preserved inside the body chamber of a Late Cretaceous scaphite in close association with what is unmistakably an upper jaw demonstrated that the aptychus is part of the lower jaw. Lower jaws are known from many ammonites, but, surprisingly, these structures have rarely been reported in baculites from North America, even though these ammonites are extraordinarily abundant in Upper Cretaceous strata of this continent. In contrast, baculite lower jaws are relatively common in upper Campanian chalks of northern Europe where they are preserved as isolated elements, and much more rarely, inside the body chamber. This paradox has led to speculation about the taxonomic distribution of baculite lower jaws, the degree of variation in their morphology, and the extent to which the vagaries of preservation have altered their appearance.


Calcite Jurassic Gypsum Chitin Stratigraphy 


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Copyright information

© Springer 2007

Authors and Affiliations

  • Neil H. Landman
    • 1
  • Neal L. Larson
    • 2
  • William A. Cobban
    • 1
  1. 1.Division of Paleontology (Invertebrates)American Museum of Natural HistoryNew YorkUSA
  2. 2.Black Hills Museum of Natural HistoryHill CityUSA

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