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| Figure 21. Closeup photograph of the volcaniclastic unit at Stop 4 exposed in the streambed just south of the Hull residence. Concentrations of small pebbles are observed only on the east side of the large basalt clast (margin marked by dashed line) shown in figure 6. This suggests that the pebbles represent a lag deposited from horizontal flow on the leeward side of the large clast. Rock hammer for scale. |