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View from the side of a small hill east of the intersection of Jackson Street and Mission Boulevard. The view is looking northwest along Mission Boulevard and the downtown area in the vicinity of old City Hall. Ongoing road maintenance has mostly masked the creeping trace (or traces) of the Hayward Fault here, but the hill represents an eroded scarp along the trace of the Hayward Fault. Gravel in the soil on the slope reveals that the bedrock in the Hayward area consists of relatively poorly consolidated alluvial fan (see glossary) and stream channel deposits. These kinds of deposits underlie the urbanized alluvial plain between San Francisco Bay and the East Bay Hills. However, the sediments closer to the bay become mud, and many areas in the urbanized region around the bay have been filled in over the years. |
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