nodosaurus (meaning "knobbed lizard") was a large, armored, quadrupedal (it walked on four legs), tank-like dinosaur. it lived in the first part of the upper cretaceous about 113–98 million years ago. three very incomplete "nodosaurus" fossils have been found in wyoming and kansas; no skulls have been found yet. it was named by paleontologist othniel c. marsh in 1889.