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Introduction, Charles E. Chapin and Wolfgang E. Elston

Ash-flow magmatism, Robert L. Smith

Cooling units and composite sheets in relation to caldera structure, Robert L. Christiansen

The Bishop Tuff: Evidence for the origin of compositional zonation in silicic magma chambers, Wes Hildreth

Rare-earth-element content of some highly differentiated ash-flow tuffs and lavas, Donald C. Noble, Ward L. Rigot, and Harry R. Bowman

Geochemistry of the Los Chocoyos Ash, Quezaltenango Valley, Guatemala, William I. Rose, Jr., Norman K. Grant, and John Easter

Geochemical correlation of genetically related rhyolitic ash-flow and air-fall ashes, central and western Guatemala and the equatorial Pacific, Gregory A. Hahn, William I. Rose, Jr., and Thomas Meyers

Ignimbrites of the Sierra Madre Occidental and their relation to the tectonic history of western Mexico, Fred W. McDowell and Stephen E. Clabaugh

Emplacement of pyroclastic flows: A review, Michael F. Sheridan

Primary and secondary flow structures in ash-flow tuffs of the Gribbles Run paleovalley, central Colorado, Charles E. Chapin and Gary R. Lowell

Welded air-fall tuffs, R. S. J. Sparks and J. V. Wright

Globule ignimbrite of Mount Suswa, Kenya, R. L. Hay, W. Hildreth, and R. N. Lambe

A model of pyroclastic surge, K. H. Wohletz and M. F. Sheridan

Significance of the flattening of pumice fragments in ash-flow tuffs, Donald W. Peterson

Ash-flow sheets and calderas: Their genetic relationship to ore deposits in Nevada, Edwin H. McKee