Minor feldspar and quart-feldspar felsic flows and flow breccias are present only to the west of the deposit.
2.
In the structural hanging wall to the west, massive felsic flows and flow breccias are present at thicknesses of up to 60 m.
3.
Proximal sections of lava flows contain vertical, well developed, large-diameter columnar joints, and lie beneath scoriaeous oxidized flow breccia, suggesting a possible subaerial origin.
4.
U . S . Highway 395 traverses the so-called " Alta Formation ", which is composed largely of pyroxene andesite flows, flow breccia, and laharic breccia.
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