ORNITHOPOD DINOSAURS FROM THE EARLY CRETACEOUS TRINITY GROUP, TEXAS, USA
Four taxa of ornithopod dinosaurs are present in the Aptian-early Albian sediments of the Trinity Group of Texas and Oklahoma, USA. A small primitive ornithopod is known from many skeletons at Proctor Lake, Texas, in the Twin Mountains Formation. The larger and more derived ornithopod, Tenontosaurus, is represented by two species. Tenontosaurus dossi occurs in the Twin Mountains Formation, low in the Trinity Group, and higher in the section, in the Paluxy Formation, a specimen is referred to T. tilletti. A fourth taxon of large ornithopod appears to be present based on fragmentary remains from the basal Antlers Formation. Tenontosaurus is the most abundant and widespread dinosaur of any type in the Trinity Group of Texas and Oklahoma. Ornithopod species diversity in the Trinity Group is similar to other Early Cretaceous dinosaur faunas. Taxa do not appear to overlap at specific localities in the Trinity Group. Like other Early Cretaceous faunas and many in the Late Cretaceous, species diversity was a product of geographic and temporal separation.
Dale A. Winkler
Department of Geological Sciences, Southern Methodist University, Dallas, Texas 75275, USA
国际会议
2005·河源国际恐龙学术研讨会(2005 Heyuan International Dinosaur Symposium)
广东河源
英文
169-181
2005-04-08（万方平台首次上网日期，不代表论文的发表时间）