1970s Aurora Prehistoric Scenes Tar Pit expansion pack is the perfect way to expand your Aurora Tar Pit. It replaces the Flying Reptile base with a base more accurate to the time period of the diorama. You can optionally add the Prehistorix leaping sabertooth base to the top of it to create more action. It also includes 2 other bases that connect with the Primeval Plastics Dire Wolf and the Alchemy Works Wooly Rhino to complete the scene.