Counting marmots…
A diverse late Jurassic dinosaur fauna, discovered in western Colorado in 1963, contains many undescribed taxa that may represent evolutionary trends at the generic level not previously reported from the Morrison Formation.A preliminary faunal hst is given.Bones of the largest known dinosaur, Ultrasaurus , are present as are a variety of small animals, including Pterosaurs, in which one sacrum displays avianlike fused sacral neural spines.A new family, the Torvosauridae , erected, based on the genus Torvosaunis that is redescribed.One of the most diverse Jurassic dinosaur faunas in North America was found on the Uncompahgre Upwarp in western Colorado in 1963.This fauna contains more undescribed taxa than has been encountered in any other North American Jurassic assemblage in this century.The first vertebrate fossil collecting on the upwarp was by the author in 1964 and continued for the next 20 years.More than 50 tons of dinosaur bone and matrix were collected from an area stretching 35 miles along the upwarp's eastern monocline.
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