Ferdinand Vandeveer Hayden (1828?–87)

American geologist and naturalist. Explored the western territories of the United States, 1853–60. Lecturer on geology in the Auxiliary Department of Medicine at the University of Pennsylvania, 1865–72. Directed several surveys for the Department of the Interior, 1867–78. Worked for the US Geological Survey from its creation in 1879 until his retirement in 1886.