Remarks On the Fossil Turtles Accredited to the Judith River Formation
Remarks On the Fossil Turtles Accredited to the Judith River Formation
Frank Hall Knowlton
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Cit. , p. 489. 56 KNOWLTON of Milk River it followed that the age must be Judith River ! Upon this assumption alone rests the claim. This species has been found by Barnum Brown in the Lance formation ("Hell Creek beds") 12 miles south of the Missouri River, on Hell Creek, Montana. This locality is about 100 miles directly south of the type locality in Canada. 5. Plastomenus punctulatus Cope. Type locality: Bijou Creek, 40 miles east of Denver, Colorado, in beds that are of Arapahoe age accordin...g to Whitman Cross. Cope also states that he had the same species from beds at Long Lake, "Nebraska" (now North Dakota), the age of which is Lance formation. Hatcher's reason for including this species in the Judith River fauna is interesting. He quotes 14 Cope's statement, evidently from his Vertebrata of the Cretaceous Formations of the West, to the effect that it was "found in association with the preceding species, " which, in this book happens to be Plastomenus costatus, but in the place where P.
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