Photo courtesy of the Alabama Museum of Natural History
This side view of an elasmosaur vertebra shows the flat front and back surfaces that easily identify it as an elasmosaur.
Mosasaur vertebrae, on the other hand, have a ball-like front surface and a cup-like back surface for articulation. This fossil
was collected in the 1930s in Pickens County and donated to state geologist Winnie McGlammery at the Geologic Survey of Alabama.