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Dedicated to J. Hoover Mackin, who initiated study of the Indian Peak-Caliente ignimbrite fi eld with his recognition in the 1950s that the "lava fl ows" near Cedar City are actually widespread ignimbrites, including the unusual trachydacitic Isom-type tuffs and the colossal Needles Range monotonous intermediates.
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Best et al. (2013) studied this question.
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