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Riggs Hill is the site of the earliest Brachiosaurus find and the first area dinosaur dig site. First excavated by Elmer S. Riggs, Assistant Curator of Paleontology at the Field Museum in Chicago, in 1900, both Stegosaurus and Allosaurus bones have also been uncovered at this paleontology hotspot. The 0.8 mile, self-guided interpretive trail offers panoramic views of Grand Valley.