The Morrison of Oklahoma and Its Dinosaurs
1938; University of Chicago Press; Volume: 46; Issue: 4 Linguagem: Inglês
10.1086/624660
ISSN1537-5269
Autores Tópico(s)Plant Diversity and Evolution
ResumoThe discovery of Morrison dinosaur bones in Cimarron County, Oklahoma, led to a study of the geology of the area. This investigation brought to light six deposits containing remains of these animals, of which four genera have been identified. The study showed that the Morrison extends down the Cimarron River, beyond Highway 38, north of Boise City. At Robbers' Roost, 4 miles east of the New Mexico state line, the Morrison is unusually thick but thins rapidly toward the east, owing to erosion of a post-Morrison dome. For this reason, and because the Morrison has only a few feet of sediment between it and the Triassic, and because it is overlain by Lower Cretaceous sediments, it seems best assigned to the Jurassic.
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