Denver Formation (Cretaceous) A sedimentary unit rich in volcanic debris typified by exposures on South Table Mountain west of Denver. Our terminology considers the Denver Formation to be part of the D1 Synorogenic Strata. Typical fossils include palm leaves and dinosaur bones. The Colorado Rockies mascot, Dinger the Dinosaur, was named because home plate at Coors Field is located in the dinosaur-bearing portion of the Denver Formation.