An Upper Jurassic theropod dinosaur from the Section 19 mine, Morrison Formation, Grants Uranium district
Andrew B. Heckert, Justin A. Spielmann, Spencer G. Lucas, Richard Altenberg, and Daniel M. Russell
Known vertebrate fossil occurrences from Jurassic strata in the mines in the Grants uranium district are few. Here, we describe fragmentary teeth, skull, and jaw elements that probably pertain to the theropod dinosaur Allosaurus. These fossils were recovered from the Upper Jurassic Salt Wash (=Westwater Canyon) Member of the Morrison Formation in the underground workings of the Section 19 mine near Grants, New Mexico. If properly identifi ed, these fossils are the stratigraphically lowest occurrence (LO) of Allosaurus in New Mexico and one of the oldest records of Allosaurus in the Morrison Formation.
- Heckert, Andrew B.; Spielmann, Justin A.; Lucas, Spencer G.; Altenberg, Richard; Russell, Daniel M., 2003, An Upper Jurassic theropod dinosaur from the Section 19 mine, Morrison Formation, Grants Uranium district, in: Geology of the Zuni Plateau, Lucas, Spencer G.; Semken, Steven C.; Berglof, William R.; Ulmer-Scholle, Dana S., New Mexico Geological Society, Guidebook, 54th Field Conference, pp. 309-314.