The Geologic Story of Mount Rainier / A look at the geologic past of one of America's most scenic volcanoes

by Dwight R. Crandell

Layer C (Between 2,150 and 2,500 years old)

Layer D (Between 5,800 and 6,600 years old)

Layer L (Between 5,800 and 6,600 years old)

Layer R (More than 8,750 years old)

Layer W (line pattern), and Layer Y (stipple pattern) (About 450 years old and 3,250 to 4,000 years old, respectively)

TABLE 1.—Characteristics, sources, and ages of pumice layers,
Mount Rainier National Park
[Based on studies by D. R. Mullineaux]