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and shape of the crossbars are distinct in each of the described species of Edaphosaurus and show a trend for larger and more elaborate (but fewer) projecting processes over time
15 inches wide and 21 inches deep
giving it a potential Upper Cretaceous-Oligocene stratigraphic range
including a good portion of the skull
Castoroides ohioensis, giant beaver Pteranodon and shape of the crossbarsCastoroides ohioensis was a species of Giant Beaver, huge members of the family Castoridae (Rodentia), endemic to North America during the Pleistocene epoch (1. 8 mya to 11,000 years ago). These giant Ice Age beavers had a length up to 8 feet and an estimated weight of 130 220 pounds; some estimates went up to 485 pounds. It lived in North America during the Pleistocene epoch, and went extinct at the end of the last Ice Age, 12,000 years ago. Fossils