A Streetcar to Subduction and Other Plate Tectonic Trips by by Clyde Wahrhaftig

By Clyde Wahrhaftig

Published by way of the yankee Geophysical Union as a part of the Special guides Series.

It is tough to be ignorant of the earth in San Francisco. equipped on rocky hills, the town is surrounded on 3 facets through bay and ocean that may be visible from approximately far and wide inside it. Precipitous cliffs face town from around the Golden Gate, and the skyline to the north, east, and south is ruled through mountains. Occasional tremors from the San Andreas and comparable faults within reach remind us that the earth this is energetic. till lately the rocks so abundantly uncovered in San Francisco baffled geologists. jumbled in with out obvious order and missing obvious fossils, they defied rationalization. the speculation of plate tectonics has replaced all that. we have an evidence for the beginning of the rocks of San Francisco, even though it is something yet simple.

Chapter 1 journey 1. A Streetcar to Subduction (pages 10–17):
Chapter 2 journey 2. To fortress Mason and Subducted Sandstone (pages 17–19):
Chapter three journey three. Baker's seashore and citadel element: a visit to Melange and Serpentine (pages 19–25):
Chapter four journey four. A Sedentary Survey of the constitution of the town (With aspect journeys Afoot) (pages 25–38):
Chapter five journey five. Marin Headlands: Pillow Basalt and Chert (pages 38–45):
Chapter 6 journey 6. a ship journey to the Blueschist Facies: Angel Island and the Metamorphosed Franciscan (pages 45–55):
Chapter 7 journey 7. After Subduction is Over: A BART journey to a rework Fault (pages 55–63):

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Extra resources for A Streetcar to Subduction and Other Plate Tectonic Trips by Public Transport in San Francisco

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The industrial area coversthe flatlandsbordering the bay that are south of the financial district and generally eastof JamesLick (101) Freeway(Figure 23). Multistoryapartmentbuildingsdominate the area south of Union Street, east of Divisadero, and north of the financial and other districts, and Market Street; they are alsocommonelsewherein the city. The remainder of the city not given to public parks is covered by single-familyhousesor by flats (two- to three-storyhouseswith separatedwellingson each floor).

The slopesof Mt. Sutro on the east,acrossLaguna Honda reservoir, exposechert overlying sandstone, probably on a thrust fault. The reservoirwasa natural lake. Beyond the reservoir are the groundsof Laguna Honda Home, San Francisco'shospitalfor the elderly. Just past Forest Hill Station (on the right--connection to Muni Metro) the bus makes a double bend to the left to climb up WoodsideAvenue to a passnearly 200 m (600 ft) abovesealevel that is surroundedby steephills rising 200-300 feet higher. Near the top of the hill on the left is the euphemisticallynamed Youth Guidance Center, behind which are exposuresof sandstone and basalt.

Here melange restson the serpentinethat makes the foundation for the south tower and bridge anchor. The contactof melangeon serpentine followsthe shore northeast,then risesgradually toward the top of the concretebridge anchor. Foliation in the serpentinecommonlywraps around massiveserpentineblocksbut generallyappearsto strike N 30ø-60øEand dip 15ø-40ø south. From here one can see the north side of the Golden Gate, where the geologyis completelydifferent (Figure 22). A major structuraldiscontinuity beneath the Golden Gate is indicated.

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