Fossils

Early Eocene epoch (55 to 49.6 MYA)

Mississippian epoch (359.2 to 318.1 million years ago)

Pennsylvanian Period (318 to 299 mya)

Upper Cretaceous period (99.6 to 65.8 MYA)

Pennsylvanian epoch (318.1 to 299 MYA)

Pennsylvanian epoch (318.1 to 299 MYA)