By Clyde Wahrhaftig
Published through the yank Geophysical Union as a part of the Special guides Series.
It is tough to be ignorant of the earth in San Francisco. outfitted on rocky hills, the town is surrounded on 3 aspects by means of bay and ocean that may be obvious from approximately far and wide inside of 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 similar faults within reach remind us that the earth this is energetic. until eventually lately the rocks so abundantly uncovered in San Francisco baffled geologists. jumbled in with no obvious order and missing noticeable fossils, they defied clarification. the idea of plate tectonics has replaced all that. now we have an evidence for the beginning of the rocks of San Francisco, even though it is whatever yet simple.
Chapter 1 journey 1. A Streetcar to Subduction (pages 10–17):
Chapter 2 journey 2. To citadel 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 town (With facet 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 remodel 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
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.
The melangematrix is not exposedbut will slither into any excavationmade by the unwary. Follow the ridge crest west to its termination in a barren field near the southeastcorner of the playground fence, go out to Geneva Avenue, and walk eastto the pedestriancrossingto the bowlingalley (17). They grade at their topsinto thinly laminated, fine sand and silt (Bouma B, C, and D units) and fi- nally into shale (Bouma E unit). Note the mural on the left as the bus turns onto Sunnydale. Near the north end of the quarrywall,a 3-msequence of blackshalerepre- sentsa longperiodwhenmud rainedontothe seaflooruninterrupted(locallyat least)by massive sand f[OW$o The coherence and relative lack of deformation (exceptfor someminorfaults)of thissequence of sandstoneand shalecontrastsstronglywith the per- vasiveshearingof sandstone and shalematrix in ex- posures of the melangenorthof GenevaAvenue.
As with Trip 3, wear scuffable clothes,hikingor tennisshoes,and carrya sweater, camera, and lunch, but no hammer. Do notwearshoeswith smoothor slippery soles. Two buslinesservethesetrips: (1) GoldenGate Transitbus 10 startsat the EastBay Terminal and makesstopsat 7thjust north of Market and on Van Nessat Geary, Sutter, Clay, and Union streets. (2) Muni Bus Number 76 runs on weekends andholidays June I to NovemberI andon Sundays onlyNovember1 toJune 1 from Caltransdepotat 4th and Townsendvia the EastBayTerminaland Sutter and Van Ness to (28).
A Streetcar to Subduction and Other Plate Tectonic Trips by Public Transport in San Francisco by Clyde Wahrhaftig