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Maiasaura (meaning "good mother lizard") is a large herbivorous hadrosaurid ("duck-billed") dinosaur genus that lived in the area currently covered by the state of Montana in the Upper Cretaceous Period
It was about the size of an elephant
The single fossil specimen assigned to this species originates from the Lower Callovian of Voulte-sur-Rhine in France
Aspidella terranovica Billings
Pachycephalosaurus, skull dome Protoceratops Maiasaura (meaning "good mother lizard")Pachycephalosaurus, meaning "thick headed lizard," is a genus of pachycephalosaurid dinosaurs. The type species, P. wyomingensis, is the only known species. It lived during the Late Cretaceous Period (Maastrichtian stage) of what is now North America. Remains have been excavated in Montana, South Dakota, and Wyoming. It was an herbivorous creature which is primarily known from a single skull and a few extremely thick skull roofs, though more complete
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