Dinosaur National Monument is a National Monument on the southeast flank of the Uinta Mountains on the border between Colorado and Utah at the confluence of the Green and Yampa Rivers. The "Dinosaur Quarry" is in Utah just to the north of the town of Jensen, Utah. This park has fossils of dinosaurs including "Allosaurus", "Abydosaurus" (a nearly complete skull, lower jaws and first four neck vertebrae of the specimen DINO 16488 was found here) and various long-neck, long-tail sauropods. 