and is densely welded. The maximum thickness of the tuff layer is approximately 180 - 200 m.

Chronology of tuff

Ash flows of the Lava Creek Tuff are divided among six members, informally named unit 1, unit 2, member A, and member B from bottom to top, with units 3 and 4 having unspecified stratigraphic positions. The emplacement of the Lava Creek Tuff was not instantaneous and continuous, but rather, there were multiple pauses, and the members were erupted

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