Abstract
The facies model approach is applied to the products of large explosive salic eruptions using the Lower and Upper Bandelier tuffs as case examples. Both tuffs show a common eruption sequence well established from studies of small-volume ignimbrite eruptions: 1) plinian fall, 2) pyroclastic surge, 3) pumice flow, forming an ignimbrite. A co-ignimbrite lag-fall deposit and “transitional flow units” are interbedded with ignimbrite flow units of the Upper Bandelier tuff near source. Fine ash dispersed as far as Texas from the Lower emption may be a co-ignimbrite ash-fall. Ground surge and ash-cloud surge deposits also occur interbedded with ignimbrite flow units. Pumice dunes are found directly below the base of the lowermost flow unit of the Lower Bandelier ignimbrite.
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