Ichthyostega

Ichthyostega is an early tetrapod that lived in the Upper Devonian period, 367-362.5 million years ago.

36" long

Acanthostega

Acanthostega appeared in the Upper Devonian (Famennian) about 365 million years ago, and was anatomically intermediate between lobe finned fishes and the first tetrapods.

24" long

Eusthenopteron

Eusthenopteron is known from several species that lived during the Late Devonian period, about 385 million years ago. Eusthenopteron was first described by J. F. Whiteaves in 1881.

26" long

Dunkleosteus

late Devonian period, about 360 – 415 Million Years Ago

this is a juvenile and is 32" long

Eurypterid

Cambrian to Permian from 510 to 248 million years ago.

11" long

The Tully Monster

The Tully Monster

(Tullimonstrum gregarium)

300 Million Years Old

First fossils found by Francis Tully at a site in

Grundy County, Illinois in 1958.

In 1989 it was officially designated the State Fossil of Illinois.

11 1/2" long