The Mesozoic is represented by fossils in six display cases. Here, too, some different animal and plant fossils are exhibited. Amongst the fossils, most characteristic of our territory, are the Triassic gastropods from the vicinity of Mežica, Jurassic ammonites from the surroundings of Triglav Lakes, Jurassic and Cretaceous gastropods from Trnovski gozd, Cretaceous and Jurassic bivalves and gastropods from the vicinity of Sežana, and remains of vertebrates, mainly fishes, from the Karst in western Slovenia. A Triassic fish is exhibited separately in the centre of the room.