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- Spatial Coverage is exactly "Unsurveyed portion of T 3 S, R 5 W near Brisbane. CPA company quarry 4100 ft. east from "Peak 1314" in
the San Bruno mountains."
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Arkosic Graywacke
Grain sizes sand to silty sand, rounded and angular with very minor examples of weathering and thin quartz vein present. Collected from the same quarry as FR-2. (FOV: 1.28mm)