This geological map of Yellowstone National Park was based on work by William Henry Holmes in 1878 as part of Ferdinand Vandeveer Hayden’s United States Geological and Geographical Survey of the ...

Slip and slide. Laser-mapping of the Yellowstone area uncovered over 1,000 landslides (outlined in yellow), most within the national park. This topographical map (red denotes higher elevations ...

Henry Wood Elliott was a dedicated conservationist and explorer who, in 1871, helped create the first bathymetric map of Yellowstone Lake. Unlike many of his contemporaries, however, he declined to ...