Geologic units containing welded tuff

Earth material > Volcanic rock > Pyroclastic rock > Tuff

Welded tuff

A glass-rich pyroclastic rock that has been indurated by the welding together of its glass shards under the combined action of the heat retained by particles, the weight of the overlying material, and hot gasses.

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Rhode Island - Washington - Wyoming

Rhode Island

Conanicut Group - East Passage Formation (Cambro-Ordovician): Conanicut Group - East Passage Formation - Red, orange-brown, and gray-green phyllite and thinly-bedded, nongraded sandstone and siltstone; rare limestone, and sparse volcanic rock including welded-tuff.
Conanicut Group - undifferentiated rock (Cambro-Ordovician): Conanicut Group - undifferentiated rock - Consists of associations of the above rock types.

Washington

Upper Eocene volcanic rocks (Late Eocene): Predominantly andesite flows and breccia; includes some basalt flows. Contains basaltic conglomerate, pyroclastic rocks, tuff beds, and sandstone in Chehalis-Centralia coal district, Lewis County.

Wyoming

Conant Creek Tuff (Phanerozoic | Cenozoic | Tertiary | Miocene): CONANT CREEK TUFF (AGE ABOUT 5.8 Ma)--Lavender rhyolite welded tuff.

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