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University of Missouri Department of Geological Sciences

Rock type:      Welded Tuff

Location:        Taum Sauk Mountain, MO

gold line

Taum Sauk is the highest point in Missouri, at 1776 feet above sea level. Much of the mountain is

made up of Taum Sauk rhyolite, which has a characteristic maroon-purplish color. The pink crystals

are feldspars, and elongated white layers are squashed pumice fragments. Rhyolite is a silica-rich

volcanic rock, in this case deposited by a hot ash flow during an enormous explosive eruption,

about 1.47 billion years ago.

Welded Tuff Welded Tuff

Photo by Alan Whittington, MU Geology

MU Geology Department