The Late Cretaceous was marked by high temperatures, with large epicontinental seaways.
During the Mid-to Late Cretaceous period the Western Interior Seaway covered the majority of North America and would connect to the Boreal and Tethyan oceans at times.
Within these regions are where the fossil of Protostega gigas have been found.
The Late Cretaceous was marked by high temperatures, with large epicontinental seaways. During the Mid-to Late Cretaceous period the Western Interior Seaway covered the majority of North America and would connect to the Boreal and Tethyan oceans at times. Within these regions are where the fossil of Protostega gigas have been found.
Protostega