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, town is surrounded on 3 aspects through bay and ocean that may be noticeable from approximately in all places 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 similar faults within sight remind us that the earth here's lively. until eventually lately the rocks so abundantly uncovered in San Francisco baffled geologists. mixed in with no obvious order and missing seen fossils, they defied rationalization. the idea of plate tectonics has replaced all that. we've got a proof for the beginning of the rocks of San Francisco, even though it is something yet simple.
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 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 info for A Streetcar to Subduction and Other Plate Tectonic Trips by Public Transport in San Francisco
A few blocks the deformedCoastRangeThrust, alongwhichthe eastof Mission,Crocker-AmazonPlaygroundis on the left (north) with McLaren Park behind it--fields Sequence, but othersdoubtthe existence of the andgroves on the gentlyrollinghillswithscattered craggyoutcrops characteristic of melangeterrain. The cragsare the exoticblocks:schist,basalt,serpentine, chert,sandstone, andgabbro; andthegentle grass-covered slopes arecommonly underlainby thedark-greyclay-richmatrixof the melange. You will have to glancequickly backwardto seethem.
It is interpreted by 3chloeher f19741to be the eastli•nb of a synclit•e whosehinge line rt•ns down ColumbusAvet•ue. '•walkwa5 witt• two boardwalk lanes branching t(; the n()rtl• (Napier Lane and Darrell Place). Tl•e h()t•sesl•('re predate the fire and earthquake, a•(t some date from the late 1850's. Early in this centu•'vthis area was favored by struggling artists and writers because it has a fine climate and view and was cheap. Once the affluent realized what the artistshad f()und, rents rose, and strugglingartists no lot•ger live here.
Davidson,the Twin Peaks,and Mt. Sutro. Some of the basalt on which the chert wasoriginally depositedis locallypresenton the southsidesof the slabs,for example, one-half block up Malta Avenue. The minor folds, probablykink foldsoriginally,are extremelydisharmonic,changing characteror dying out altogetherwithin a few metersacrossthe bedding. This together with their marked asymmetrysuggeststhat they are drag folds rather than compressionalphenomena. To study the folds closeat hand, quickly cross O'Shaughnessy betweenlight poles5 and 6, watching carefullyfor traffic.