Eruptions produced hornblende andesite lava flows and lithic tuffs.
2.
The top member consists of a reddish lava flow and another lithic tuff unit.
3.
The Seelys formation, next in the order, consists of lithic tuff and pumice-littered lithic lapilli-tuffs, banded, pumiceous, crystal tuff, and densely welded crystal tuff.
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