While expanding a reservoir in Snowmass Village, Colorado, workers stumbled upon a big bone. And then another, and another, and another. Realizing they found something special, the workers called in the experts at the Denver Museum of Nature & Science (DMNS), who drove several hours to examine the site. Scientists quickly realized that this was no ordinary boneyard. Work on the reservoir halted, as DMNS scientists called in dozens of volunteers and experts from around the country to help excavate the site before construction continued. In a few weeks of excavating, the scientists and volunteers of the Snowmastodon Project uncovered an entire Pleistocene ecosystem, including fossils of giant ground sloths, long-horned bison, North American camels, mammoths, mastodons, insects and ancient plants.