SOUTH DAKOTA Department of
Environment & Natural Resources

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Pierre, SD 57501
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South Dakota State Geologists


J.E. Todd - State Geologist from 1893 - 1903

J.E. Todd

Ellwood C. Perisho - State Geologist from 1903 - 1914

Perisho

Freeman Ward - State Geologist from 1915 - 1926

Ward

E. P. Rothrock - State Geologist from 1926 - 1957

Rothrock

Allen F. Agnew - State Geologist from 1957 - 1963

Agnew

Duncan J. McGregor - State Geologist from 1963 - 1978

McGregor

Merlin J. Tipton - State Geologist from 1978 - 1992

Tipton

Cleo M. Christensen - State Geologist from 1992 - 1997

Christensen

Derric L. Iles - State Geologist from 1997 - Present

Iles