Fossils

Mississippian epoch (359.2 to 318.1 million years ago)

Middle Devonian (391-385 mya)

Middle Devonian (391-385 mya)

Devonian period (416 to 359.2 MYA)

Devonian period (416 to 359.2 MYA)

Cambrian period (542 to 488.3 MYA)

Devonian period (416 to 359.2 MYA)

Ordovician period (488.3 to 443.7 MYA)

Devonian period (416 to 359.2 MYA)

Devonian period (416 to 359.2 MYA)

circa 1970s