Sinosauropteryx
Three specimens have been assigned to "Sinosauropteryx prima": the holotype GMV 2123 (and its counter slab [opposite face], NIGP 127586), NIGP 127587, and D 2141. Another specimen, IVPP V14202, was assigned to the genus but not to the only species by Zhang and colleagues. The assignment of an additional larger specimen to "S. prima", GMV 2124, was later found to be in error. All of the fossils were found in the Jianshangou or Dawangzhangzi Beds of the Yixian Formation in the Beipiao and Lingyuan regions of Liaoning, China. These fossil beds have been dated to 124.6–122 million years ago, during the early Aptian stage of the Early Cretaceous.
When Dinosaurs Roamed America
The program moves on to the Early Jurassic of Pennsylvania, showing a pack of "Syntarsus". These dinosaurs, closely related to "Coelophysis," are hunting the primitive herbivorous dinosaur "Anchisaurus"; one of the Syntarsus is killed when the initial attack fails, and they are chased away by a "Dilophosaurus", which kills the "Anchisaurus" to feed her young. A second Dilophosaurus arrives as well, and after a short but vicious fight it is driven away, allowing the first Dilophosaurus and her young to feed in peace. The narrator then explains "Syntarsus" and "Dilophosaurus" will become the gigantic carnivores such as "Allosaurus" and "Tyrannosaurus", while "Anchisaurus" will become the sauropods.