Three-toed meat-eating dinosaurs left tracks here along the edge of lakes between dunes in a vast sand dune sea, or erg. A high water table and springs fed these lakes, and wind gently buried tracks and animal burrows along the shoreline in shifting sand, preserving them. Many animals in the environmental reconstruction are based on trackway evidence. In this area, only two complete body fossils have been found in the Jurassic-aged Navajo Sandstone: Seitaad, a prosauropod, and Segisaurus, a small theropod. The skeletal remains of the large theropod that left the Eubrontes track type have not been found in the Navajo Sandstone, so its reconstruction is speculative and based on similar large theropods of the same age found elsewhere in the world. Traces of the plants and burrows shown in the illustration have only been found in the Moab area. Clam beds at this site indicate that these lakes were stable enough to support slow-growing aquatic life. A diversity of dinosaur tracks appears here, including both impressions and positive casts formed when overlying sediment filled the impressions. A Grallator track is surrounded by invertebrate burrows, and small animal burrows and cavities left by decaying plant stems were sometimes filled by wind-blown sand and preserved as internal casts later exposed by erosion.