Geology

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

By Clyde Wahrhaftig

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

It is difficult to be ignorant of the earth in San Francisco. equipped on rocky hills, the town is surrounded on 3 facets by means of bay and ocean that may be noticeable from approximately all over the place inside of it. Precipitous cliffs face the 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 close by remind us that the earth this is energetic. until eventually lately the rocks so abundantly uncovered in San Francisco baffled geologists. mixed in with no obvious order and missing noticeable fossils, they defied rationalization. the speculation of plate tectonics has replaced all that. we've got an evidence for the beginning 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 citadel Mason and Subducted Sandstone (pages 17–19):
Chapter three journey three. Baker's seashore and fortress element: a visit to Melange and Serpentine (pages 19–25):
Chapter four journey four. A Sedentary Survey of the constitution of 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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Additional resources for A Streetcar to Subduction and Other Plate Tectonic Trips by Public Transport in San Francisco

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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. After examiningthe turbiditesand, if you need, consuming a cocktailor snackat the bowlingalley, walk easton Genevato a bus stopoppositethe end of Brookdale, and board the next eastboundNo.

Its grey-green road cut exposurescan be seenfrom many points alongThird. Near Palau, watchtbr explosivelycolorfulmuralson the wallsof Hunters Point CommunityCenter on the right, andjust beyond, alsoon the right, facing north on Newcomb,is the South San FranciscoOpera House, built in 1888 in Italianate style. Beyond,Third Streetentersthe major industrial area of San Francisco. India Basin Industrial Park, siteof former abattoirs,is on the right, and 37 the drawbridgeover IslaisCreek Channel. North of Bernal Heightsand lslaisCreek, the high grey hill behind the huge gastank is Potter() Hill, about 100 m high, the largestexposureof serpentinein the city.

These exposuresare the last Franciscanwas subductedbeneath the Great Valley thrust(seeErnst[1981] for discussions). The highest pointvisibleisMt. Hamilton,1333m (4372ft), whose summit is decorated with the white domes of LickObservatory. The highest point,in the far distance, is LomaPrieta,1155m (3791 ft). Most of the flatland in the foregroundwasonce partof theBayandwasfilledwithSanFrancisco's garbage. The lastthreeparagraphs of thesidetrip describe the outcrop. No. 15 turns left from Geneva onto Santos.

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