Most of the displays are fossils from the late Cretaceous period of the Mesozoic era, which are found in abundance in the Hobetsu area of Mukawa Town.

Exhibits include the restored skeleton of the Hobetsu-Araki-Ryu plesiosaur, whose discovery led to the museum’s opening, and the largest dinosaur skeleton unearthed in Japan, a fossil of Kamuysaurus japonicus, a plant-eating dinosaur nicknamed the Mukawa dinosaur after the town where it was discovered. The museum also holds and exhibits numerous ammonites.