J. E. Fassett, S. G. Lucas, R. A. Zeilenski, and J. R. Budahn have found an isolated hadrosaurid (a duck-billed, plant-eating dinosaur) femur (thigh bone) in the Ojo Alamo Sandstone of the San Juan Basin in New Mexico and Colorado, USA. The find was dated by the Paleocene epoch pollen that was in the sedimentary level (3 m) below the dinosaur bone.
The duck-billed dinosaurs are also called hadrosaurs (which means heavy or bulky lizards). These plant-eating dinosaurs had a wide, flat, toothless beak, hundreds of cheek teeth and powerful jaws. Their hind legs were large and each limb had four digits.
Hadrosaurid, were the biggest ornithopods (a type of ornithischian or bird-hipped dinosaurs). They could walk on two or four legs. These plant-eaters lived during the late Cretaceous period (and perhaps later) Maiasaura, Edmontosaurus, Hadrosaurus, etc. were hadrosaurs. The hadrosaurs evolved from the iguanodontids.
Fassett, J. E., S. G. Lucas, R. A. Zeilenski, and J. R. Budahn. 2000. Compelling new evidence for Paleocene dinosaurs in the Ojo Alamo Sandstone, San Juan Basin, New Mexico and Colorado, USA., Catastrophic events and mass extinctions, Lunar and Planetary Contribution No 1053. Lunar and Planetary Institute, Houston.
A chart of geological time.
Information on mass extinction and the extinction of the dinosaurs.
Information on the hadrosaurs (the duck-billed dinosaurs).
Creatures and climate of the Cretaceous period, which immediately preceded the Paleocene epoch.
Other fossils found in North America.
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