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Geologic Trips, Point
Reyes Peninsula Point Reyes Lighthouse The Point Reyes Peninsula is separated from the mainland by
the San Andreas fault. Many of the rocks on the peninsula are from south and
central California and have been carried to their present position by
movement along the San Andreas fault over the last 25 million years. The Point Reyes
Lighthouse is built on the Point Reyes Conglomerate. This conglomerate is
extremely hard and has resisted erosion so that it now forms the east and
west tips of the Point Reyes Headlands.
Similar conglomerate occurs
near the Monterey Peninsula, 100 miles to the south. It is likely that these are the same conglomerate and
that the Point Reyes
Conglomerate was carried northward from the Monterey area along the San Gregorio fault, one of the many faults of the San Andreas
fault system. Exterior Websites National Park Service: USGS:
Geology of Point Reyes N Seashore Wikipedia: _____ |
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Point Reyes Lighthouse and the
308-step-path down to the lighthouse. |