Devils Tower

National Monument · Wyoming

Park Stats

Area1,347 acres

Tower height386 m above river

Summit1,558 m

Established1906 (first US NM)

DEMUSGS 3DEP 10m

Notable Features

Tower summit1,558 m
Tower base1,267 m
Belle Fourche River1,172 m

Layer

Colored Hillshade

Elevation

Hillshade

Opacity 100%

About

Devils Tower is an igneous intrusion of phonolite porphyry — magma that pushed up into sedimentary rock ~50 million years ago but never broke the surface. Erosion has since stripped away the softer sediment, leaving the resistant pillar standing alone. The vertical columnar jointing (some columns are 3 m wide and 180 m tall) is unusually pristine, making this one of the most distinctive geologic landmarks in North America.

10 m colormap + 10 m hillshade NW @ 45° · sources at /data