Early Cretaceous

Cedar Mountain Formation

The Central Interior is an arid zone characterized by the Deinonychus Tenontosaurus fauna through the middle Cretaceous.  The best finds of raptors and other small theropods traditionally comes from arid environments that larger dinosaurs did not favor. Flowering plants are present but are not yet the dominate flora as they will be later.  The Cycadoids and cycads are declining leaving conifers and ferns as the most important plants species. The updated 042016
 HLBS Deinonychus
One of the largest dromaeosaurids, until the discovery of Utahraptor, Deinonychus could probably run at 40 kph (25mph) when necessary. It preyed almost entirely on the hadrosaurid Tenontosaurus. New material unearthed in 1993 indicates that it resembled Dromaeosaurus much more than Velociraptor, with a large skull and high, rounded snout.

CollectA Tentontosaurus Carnegie Safari DeinynuchusPaleontologists have found multiple, individual fossils of Velociraptor's close North American relative, Deinonychus.  Deinonychus antirrhopus , (Terrible Claw) one of the most important dinosaur fossil ever discovered, Dr. J.H. Ostrom's (of Yale University) 1969 and 1976 descriptions of 

Bullyland DeinonychusDeinonychus  were a major contributor to the re-evaluation of dinosaur activity levels and the similarities between it and modern birds. A famous find of Tenontosaurus with with Deinonychus fossils has be been reconstructed as fatal encounter between a pack and the much larger herbivore.

FameMaster Utahraptor Schleich SauropeltaGastonia is the largest and best known polacanthine ankylosaurid closely related to Polacanthus and Hoplitosaurus. It exhibits a mixture of ankylosaurid (head) and nodosaurid (body) characteristics and suggests that the division between these families may turn out to be artificial. The skull of Gastonia has a number of features that make it unique among ankylosaurids, and its dorsal armor is also unique, consisting of solid scutes with radial ornament. The largest scutes are up to 9 inches across, and some on the tail are even larger. Pairs of spines run along its sides, and are largest at the shoulders. Across the pelvis the armor is fused into a solid shield. Between the larger pieces of armor are hundreds of smaller ossicles up to 1 inch in diameter. The structure of the skull suggests that Gastonia may have headbutted. Its defensive behavior probably involved use of its formidable shoulder spikes together with sideways slashing movements of the heavily armoured tail.

GeoWorld Falcarius

Falcarius is a transitional form between meat eating theropods and the plant eating therizinosaurs. I was a small animal 14 ft long.  It is found in large bone beds.