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An Allosaurus From The Morrison Formation (Late Jurassic) Of Converse County, Wyoming, Dennis D. Roth
An Allosaurus From The Morrison Formation (Late Jurassic) Of Converse County, Wyoming, Dennis D. Roth
Master's Theses
I describe a partial skeleton of a theropod from the Later Jurassic Morrison Formation of Converse County, Wyoming. Collected material included 17 vertebrae, three ribs, two associated left metatarsals and an incomplete ilium of an Allosaurus in a gray silty-mudstone containing conchostraca. Several vertebrae are deformed with transverse processes broken and pressed against the neural spine, or twisted transverse processes from lateral or dorso-venteral compression. The material has evidence of erosion prior to deposition, as well as during postfossilization. I propose the deformation of the vertebrae is due to a demineralization of the bones. The flattened surfaces appear to have …
A New Carnosaur (Dinosauria: Theropoda) From The Upper Morrison Formation (Late Jurassic, Tithonian) Of Colorado, Sebastian Dalman
A New Carnosaur (Dinosauria: Theropoda) From The Upper Morrison Formation (Late Jurassic, Tithonian) Of Colorado, Sebastian Dalman
Master's Theses
A disarticulated skeleton of a theropod from the Late Jurassic (Tithonian) strata of McElmo Canyon in Montezuma County, Colorado was discovered in 1953 by the late J. T. Gregory and D. Techter. For nearly 55 years the specimen remained unnoticed in the collection of the Yale Peabody Museum of Natural History in New Haven, Connecticut. Several cranial and postcranial elements are relatively well preserved and include the premaxilla, maxilla, dentary, teeth, quadratojugal, braincase, metacarpals, partial pubis and ischium, astragalus, partial tibia and fibula, metatarsals, pedal phalanges, and several partially preserved ribs. The specimen represents a new genus and species of …