LATE
CRETACEOUS
HELL CREEK FORMATION.
The Hell Creek armored are large, heavily built andquadrupedal herbivors, with rows of boney armour(osteoderms) on the surfaces of the body. Two kinds the tank like Ankyosaurus and Edmontonia wandered into the flood plains. They are built to feed low and the fully grown adults would have been dangerous prey.
mouse over diorama pics for figure information.
Ankyosaurus estimated at 20.5 feet long had
armor, consisting of massive knobs and boney scutes in the skin.
The bone breaking tail club was made of large osteoderms fused to the last of the tail bones. 
The flexible skin of Ankylosaurus was covered with thick, hard ovals of embedded bone like an armadillo, and it had bony shelves over its eyes. It was the latest ankylosaur and seems to have
lived in upland areas.

Edmontonia was bulky and tank-like at roughly 22 ft long. It had small, ridged bony plates on its back and head and many sharp spikes along its back and tail. The four largest spikes jutted out from the shoulders on each side, two of which were split into subspines in some specimens.
There are indeterminante nodosaur remains from Hell Creek assigned to Edmontonia.
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