This year is the National Park Service’s Centennial anniversary. In recognition, we thought we would take a look at one of the geological surveys that inspired the founding of Yellowstone National Park. In recent months, researchers in increasing numbers have looked for specimens and field documentation relating to Yellowstone, specifically from the Hayden Geological Survey of 1871. This survey is important for a number of reasons. It was the first federally funded survey, and was instrumental in introducing the American public to Yellowstone’s natural wonders. It inspired Congress to establish Yellowstone as the first national park in 1872. Smithsonian is a repository for specimens and documentation from the Hayden Geological Survey and numerous others relating to the U.S.