, August 24, 1870. Hayden sits at far end of table in dark jacket. (Photo by
William Henry Jackson, standing at far right) After the American Civil War Hayden led geographic and geologic surveys of the Nebraska and Western Territories for the United States Government. In 1867 he was appointed geologist-in-charge of the
United States Geological and Geographical Survey of the Territories. In 1869, Hayden led an expedition along the Front Range to Denver and Santa Fe. In 1870 he received a $25,000 governmental grant to lead a 20-man expedition to South Pass, Fort Bridger, Henry's Fork, and back to Cheyenne. About this time, he also became identified with the
Megatherium Club at the
Smithsonian Institution in Washington, D.C. To measure distances during their journeys into the western frontier Hayden employed the use of an
odometer, a device used by mappers to estimate distances traveled. The device was mounted on a mule-drawn cart that measured distances as the cart wheels rolled along. Because of rough terrain the device was accurate to within about 3%.
Yellowstone , 1871 In 1871, Hayden led America's first federally funded
geological survey into the
Yellowstone region of northwestern
Wyoming, given directions by President
Ulysses S. Grant's Secretary of Interior
Columbus Delano. The survey consisted of some 50 men which included notables such as painter
Thomas Moran and famous frontier/Civil War photographer
William Henry Jackson. The following year, Hayden and his work,
Preliminary Report of the United States Geological Survey of Montana and Portions of Adjacent Territories; Being a Fifth Annual Report of Progress was instrumental in convincing Congress to establish Yellowstone as the first U.S.
National Park, aided by Jackson's stunning large-format photographs and Moran's dramatic paintings. These publications also encouraged the westward expansion of the United States. ==Later life==