Welded tuff in eastern California

A compositionally zoned ash-flow sheet in southern Nevada

“…Formation of slight primary dips would appear to be possible regardless of the fact that the upper surfaces of ash-flow sheets are widely observed to be planar (Marshall, 1935;Gilbert, 1938;Smith, 1960a). This possibility suggests the additional hypothesis · that the momentum of the early voluminous ash flows of the Topopah Spring, as they moved along their arcuate course, may have caused the tuffs to be deposited with a slight northward slope toward the inside of the arc.…”

Mineral resources of the Minarets Wilderness and adjacent areas, Madera and Mono counties, California

“…30). The resulting ash-flow deposits, which constitute the Bishop Tuff (Gilbert, 1938;Sheridan, 1965;Hildreth, 1979), cover an area of900 km 2 surrounding the caldera. Subsequent volcanism was confined within the west half of the caldera and consisted of intermittent eruption of rhyolite and quartz latite domes and flows between 0.67 and 0.05 m.y.…”

Lithology and eruptive history of the Whakamaru ignimbrites in the Maraetai area of the Taupo volcanic zone, New Zealand

“…Specific examples of most of them have been described in the relatively early papers on the Bishop Tuff, California (Gilbert, 1938), the Wineglass Tuff, Crater Lake (Williams, 1942), and the Chiricahua welded tuffs of Arizona (Enlows, 1955). Martin (1959) noted the~eneral occurrence and significance of the following lithologic zones in ignimbrites: (1) basal ash, (2) glass zone, (3) lithoidal zone, and (4) the poorly welded upper zone.…”