Welded tuff (western USA), (public display, Geology Departm…
(public display, Geology Department, Wittenberg University, Springfield, Ohio, USA) ----------------------------------- Igneous rocks form by the cooling & crystallization of hot, molten rock (magma & lava). If this happens at or near the land surface, or on the seafloor, they are extrusive igneous rocks. If this happens deep underground, they are intrusive igneous rocks. Most igneous rocks have a crystalline texture, but some are clastic, vesicular, frothy, or glassy. Volcanic tuffs are solidified ash deposits - they form by explosive volcanic eruptions, as do volcanic breccias. Volcanic tuffs lack the abundance of large, angular grains present in volcanic breccias (although I
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Eocene volcanism during the incipient stage of Izu–Ogasawara Arc
Bishop Tuff in Long Valley Caldera, California
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welded tuff geologictimepics
USGS: Geological Survey Bulletin 1161-D (Stratigraphy)
Welded tuff, rock
Tuff - Igneous Rocks
Eocene volcanism during the incipient stage of Izu–Ogasawara Arc
Tuff - Igneous Rocks
Tuff - Igneous Rocks
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