By Clyde Wahrhaftig
Published via 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 by way of bay and ocean that may be visible from approximately in all places inside it. Precipitous cliffs face the town from around the Golden Gate, and the skyline to the north, east, and south is ruled by means of mountains. Occasional tremors from the San Andreas and comparable faults close by remind us that the earth here's lively. 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. we have an evidence for the starting place 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 aspect: a visit to Melange and Serpentine (pages 19–25):
Chapter four journey four. A Sedentary Survey of the constitution of the town (With part 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
Shelley Drive to a water tower (4) on the hilltop. From the base of this tower, much of San Francis- co can be seen. To the northwest are Mt. Davidson, Mt. Sutro,the Twin Peaks,and DiamondHeights. To the north is Bernal Heights, its summit a flat slabof red chert. n, • 2 3 30•,. 24. Geologic sketch mapof partof O'Shaughnessy Boulevard andGlenCanyon Park,showingrouteof sideTripA: 1,lightpolementioned intext;2, boundary ofoutcrop; 3, strike anddipof bedding inchert;4, average strikeanddipof irregular bedding; 5, bearing andplunge of hinge line offold;6, location ofvertical hingeline;7,spotelevation inmeters (feet), estimated fromtopographic map; ch, chert; ha, basalt;ss, 32 Return to (3), and take the pathway on the hillside east of Prague to the corner of Brazil and La Grande (9).
21. Block of thin-bedded sandstoneand shale with indistinctcontactswith matrix; locality26, Figure 19; sketchedfrom a photograph. A zig-zag pattern in relict beddingand fbliation suggeststight chevronfolds that were broken along appressed hinge lines. At (26), serpentineis interlayeredwith melangein layers 2-5 m thick. At the baseof the bluff a body of nearly flat-lying but overturned thinly bedded sandstone and shale is nearly intact in its interior but crushed around its •nargins,so that its contactswith the enclosingmelangematrix are indistinct(Figure 21).
24 and intermediate tides and exposeslandslidedebris: an assemblage of rounded serpentinebouldersin a matrix of extremely "fat," sticky,greenishto white clay, probablyremolded from slickentiteserpentine. The bright orange sand and clayjust south of (22) are fragmentsof Pleistocene deposits,and soilsslid from their original positionsnear (23) at the headwall of the landslide, where similar materials are still in place. At (22) a large tectonicblock of well-cemented but highly deformed dark-grey sandstoneand shale forms a 5-m-high promontory that juts into the sea.