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These mosasaur vertebra come from the chalk formations of Kansas, and can be attributed to various species. Small pieces usually contain up to 1 to 2 individual vertebra each, while large ones usually have 2 to 4!
The term mosasaur doesn't refer to a single prehistoric animal, but rather a group of least 40 genera of extinct marine reptiles that lived about 70 million years ago during the Late Cretaceous period.
Mosasaurs were air breathing, had an elongated crocodilian snout, and were fast swimmers thanks to their four fins and tail. They could range in length from just over 3 feet to 56 feet depending on the species. Mosasaurs were carnivores, and their agility made them the dominant marine predators of their era.
Small: 0.5 to 1 inches long
Large: 1 to 2 inches long