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

By Clyde Wahrhaftig

Published via the yankee Geophysical Union as a part of the Special courses Series.

It is difficult to be ignorant of the earth in San Francisco. outfitted on rocky hills, town is surrounded on 3 facets by way of bay and ocean that may be obvious from approximately in every single place inside of it. Precipitous cliffs face 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 comparable faults close by remind us that the earth here's energetic. till lately the rocks so abundantly uncovered in San Francisco baffled geologists. jumbled in with out obvious order and missing noticeable fossils, they defied rationalization. the speculation of plate tectonics has replaced all that. we have an evidence for the foundation of the rocks of San Francisco, even though it is whatever yet simple.

Content:
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 castle aspect: 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 rework Fault (pages 55–63):

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

Sample text

Customs House massive sandstone bed. The cliff is the back wall of a quarry that provided rip-rap for the Etnbarcadero. Side trip D is a climb up the stepsof this cliff to see the sandstone close at hand at the top. Bus No. 42 continues and visit Colt Tower northwest on the Embarcar- der() and left onto Bay. From Bay it turns right Ness. Fishermen's and left on North Wharf is three Point to Van blocks north of Bay and Columbus, and on North Point, No. At Van Nessyou are beside For• Mason (FM) ('Frip 2).

52 bus to the corner of Mission and Ge- nevaand shouldskipto the end of the description of this side trip. Side Trip B (Figures 26, 27, and 28) This side trip beginsin the northwest corner of McLaren Park, where blocksof serpentine,schist,gabbro,basalt, chert, and sandstone are embedded in a me- lange matrix of sheared shale and sandstone,and endsat CastleLanes BowlingAlley on GenevaAvenue in an abandonedquarry whosewallsexpose turbidite beds of the San Bruno Mountain Block, which according to some is an outlier of the Great Valley Sequence(seeTrip 7).

For brevity, only three are describedhere: No. 1 (California) for architecture, No. 38 (Geary) for conve- nience, and No. 6 (Parnassus) for the view. The oth- ers are shown on the Muni route map, and houses on them are describedin architecturalguides. Landmark buildings visiblefrom all three routes are Saint Mary's Catholic Cathedral (SMC, Fig. 23), built in 1971 and composedof four marble hyperbolicparabaloids190 feet high that castinteresting shadowson each other; the red-tiled orange Byzantine dome of Temple Emanu-el (TE), built in 1924; St.

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