Figure 2. The Arena Valley ash and the stratigraphy of the sample site. Widths of the stratigraphic columns represent relatively larger average sediment grain size of the unit. D.P. indicates a desert pavement. At this site, the Arena Valley ash is 15 cm thick, beginning 3 cm below the desert pavement that makes the current surface. The Arena Valley ash has an 40Ar/39Ar age of 4.33 Ma (Marchant et al. 1993) and rests on a desert pavement that caps the Monastery colluvium.
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