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Publication Extents

Not all publications have extents, not all extents are completely accurate
Zones and zonal variations in welded ash flows
R. L. Smith
1960, Professional Paper 354-F
Welded tuffs are recognized as special parts of ash flows, other pyroclastic flows, or, more rarely, air-fall deposits. Ash flows may be emplaced at any temperature below a maximum eruption temperature. Those emplaced above a minimum welding temperature may show any and all degrees of welding and crystallization. ...