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Upper Cretaceous Dinosaurs from the Bearpaw Shale (Marine) of South-Central Montana with a Checklist of Upper Cretaceous Dinosaur Remains from Marine Sediments in North America

John R. Horner
Journal of Paleontology
Vol. 53, No. 3 (May, 1979), pp. 566-577
Stable URL: http://www.jstor.org/stable/1303998
Page Count: 12
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Upper Cretaceous Dinosaurs from the Bearpaw Shale (Marine) of South-Central Montana with a Checklist of Upper Cretaceous Dinosaur Remains from Marine Sediments in North America
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Abstract

Four dinosaur specimens from the marine Bearpaw Shale Upper Cretaceous) of south-central Montana, reported by Earl Douglass in 1902 but hitherto undescribed, are assigned to the genera Hadrosaurus [Kritosaurus], Lambeosaurus and Panoplosaurus. These dinosaurs, the first to be reported from the Bearpaw, are included in a revised census of dinosaur specimens from marine Upper Cretaceous sediments in North America. The new checklist reveals a relative abundance (primarily in the western interior) of hadrosaurines (noncrested duckbills) and nodosaurs (armored dinosaurs), groups which may have inhabited marginal-marine environments. Approximately one-half of the hadrosaur specimens from marine sediments are from young or juvenile individuals the size of or smaller than the type of Claosaurus agilis and over three-quarters of the specimens are from individuals smaller than the type of Hadrosaurus foulkii.

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