By Clyde Wahrhaftig
Published by way of the yankee Geophysical Union as a part of the Special guides Series.
It is difficult 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 noticeable from approximately in every single place inside it. Precipitous cliffs face the town from around the Golden Gate, and the skyline to the north, east, and south is ruled by way of mountains. Occasional tremors from the San Andreas and similar faults within reach remind us that the earth here's lively. till lately the rocks so abundantly uncovered in San Francisco baffled geologists. mixed in with out obvious order and missing noticeable fossils, they defied rationalization. the idea of plate tectonics has replaced all that. 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 castle Mason and Subducted Sandstone (pages 17–19):
Chapter three journey three. Baker's seashore and fortress aspect: a visit to Melange and Serpentine (pages 19–25):
Chapter four journey four. A Sedentary Survey of the constitution of the 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 rework Fault (pages 55–63):
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Released by way of the yankee Geophysical Union as a part of the specific courses sequence. it's difficult to be blind to 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 in every single place inside it. Precipitous cliffs face the town from around the Golden Gate, and the skyline to the north, east, and south is ruled via mountains.
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Additional resources for A Streetcar to Subduction and Other Plate Tectonic Trips by Public Transport in San Francisco
To the west is Mt. Davidson,at 283 m (929 ft) the highestpoint in the city. The canyon below is Glen Canyon Park. On its far side, natural exposuresof chert, making lines of cragsand cliffs diagonallydownward to the north, are practicegrounds for rock climbing. Road cutson the right exposechert in fantasticfolds. Side Trip A (Figures 24 and 25) Debusat Malta, crossto the east side of O'Shaughnessy,and walk north to study at leisure the outcropsyou just flew past. The descriptionis keyed to the light poles 3O the westsideof the street;theseare labeledin Figure 24.
The large building crowningthe knoll on the skylineto the westis San FranciscoCity College (SFCC). The hillside west of the tower has been cut away to make a flat tbr the houses below. • N Most of the rock in the cut (invisible from here) is sandstone with a strongschistosity, characteristicof textural zone II (seeTrip 6), but at its north end are exposuresof amphibolite,basalt,and serpentine(5), reachedby continuing north along the path by which you entered the park. North of (3), Shelley Drive curves east around a tree-coveredknoll.
The earthquakeand fire of 1906 destroyedmost of the area east of Van Ness and north of Mission Bay, but the city wasquickly rebuilt and by 1915 extended to the ocean on both sides of Golden Gate Park. A streetcartunnel opened in 1917 beneath the Twin Peaksmade accesseasyto the dune field west of Twin Peaks, and the field was covered with Trip 4. A Sedentary Survey of the Structure of the City (With Side Trips Afoot) This is a circle tour of San Franciscoby Muni bus to see, mainly at a distance,outcropsof each of the five structuralbelts that underlie the city (Figure 5).
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