Читать книгу Hadrosaurs - David A. Eberth - Страница 92

DINOSAURIA Owen, 1842

ORNITHISCHIA Seeley, 1888

ORNITHOPODA Marsh, 1882

HADROSAUROIDEA Cope, 1869

HADROSAUROIDEA indet.

Material Hadrosauroid represented by at least two individuals. UTA-AASO-2003 appears to represent an adult individual, and includes a scapula, coracoid, ilium, ischium, pubis, cervical and dorsal ribs, an axis, and cervical, dorsal, and caudal vertebrae. UTA-AASO-125 is a partial femur from a subadult or juvenile individual.

Locality and Horizon All specimens were recovered from UTA Location 50 (the Arlington Archosaur Site; AAS), northern Arlington, Tarrant County, TX. GPS coordinates for the location, maps of the AAS excavation, and collections database with all relevant site data are on file with the Perot Museum of Nature and Science, Dallas, Texas. The specimens are from a single bone-bearing horizon in a clay-rich paleosol within the Lewisville Member of the Woodbine Formation (Cenomanian). UTA-AASO-125 is likely from the same horizon, but the exact location is unknown.

Comments Hadrosauroid remains designated UTA-AASO-2003 were recovered as disarticulated but associated elements from an ~6 m² area through ~0.6 m of section. Most of the material was collected by UT Arlington students Phil Kirchhoff and Bill Walker (who also discovered the site) in collaboration with Art Sahlstein. Initial excavation of the site occurred prior to the authors’ involvement with the project, and before large-scale excavation and study began. Maps of the initially recovered material were generated by interviewing Kirchhoff and Sahlstein, and by reviewing photos of the initial dig. All known AAS hadrosauroid material was prepared at the Earth and Environmental Sciences Department, UT Arlington. The material was prepared by DJM and paid student interns under his supervision. All prepared fossils were later donated to the Perot Museum of Nature and Science, Dallas, Texas.

5.4. Axis of UTA-AASO-2003. (A) anterior view; (B) left lateral view; (C) posterior view.