California Geological Survey California Division of Mines and Geology
Bulletin 202
Geology of the Point Reyes Peninsula, Marin County, California


There are still many unanswered questions about the geology of Point Reyes Peninsula. The following are some suggestions for further study:

(1) Search the metamorphic limestones for fossils, such as crinoid plates or siliceous organisms.

(2) Make a detailed petrologic study of granitic rocks.

(3) Determine the provenance of the Franciscan tectonic inclusions of the San Andreas fault zone.

(4) Analyze the rocks of the Paleocene conglomerate and compare with rocks from Cordell Bank, Sugar Loaf Rock on the Farallon Islands, and the Carmelo Formation.

(5) Study the foraminiferal succession of the Miocene rocks.

(6) Study the fossils and mineralogy of the glauconite bed, and the fossils of the shales, of the Drakes Bay Formation.

(7) Geomorphic study of (a) the marine terraces and high-level peneplane and their interrelationships, (b) the topographic features of the fault zone, (c) erosional rate of sea cliffs, and (d) the development of Bear Valley and Pine Gulch Creek.

(8) Geochronologic study of the K—Ar dates of granitic rocks of Point Reyes, Point Tomales, Bodega Head, and Cordell Bank.

(9) Using shallow seismic methods, study the submarine connections between Point Reyes Peninsula and adjacent sections of the San Andreas fault zone.

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Last Updated: 28-Nov-2007