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The AAPG/Datapages Combined Publications Database
Wyoming Geological Association
Abstract
A Summary of Morrison Formation (Jurassic: Kimmeridgian-Tithonian) Geology and Paleontology, With Notice of A New Dinosaur Locality in the Bighorn Basin (USA)
Abstract
Dinosaur remains have been discovered in the Upper Jurassic Morrison Formation on the Warm Springs Ranch near Thermopolis, Wyoming. The new locality provides an opportunity to expand upon the knowledge of the fauna and paleoenvironments of the Morrison Formation in the Bighorn Basin. Preliminary stratigraphic studies have identified three major lithologic units. Upper and lower mudstone units, which can be interpreted as dominantly moderate to poorly drained floodplains with vertically aggrading channels, are separated by a sandstone unit representing a larger fluvial system. Since the discovery of the fossils in 1993, over 40 surface localities have been documented and two quarries have been worked. Although faunal studies are still in early stages, eight dinosaur genera have been tentatively identified. Of greatest significance to date is the occurrence of a very large probable brachiosaurid, the first reported in the state of Wyoming. Non-dinosaurian fossils are rare, and include isolated occurrences of a gastropod, an internal pelecypod cast, and a possible mammal or bird bone. Floral remains are abundant, however, no positive taxonomic identifications have yet been made.
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