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By Clyde Wahrhaftig, Doris Sloan

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Published through the yank Geophysical Union as a part of the Field journey Guidebooks Series.

The San Francisco Bay zone is likely one of the greatest websites on the planet to work out the consequences on land of plate tectonics. Now a part of a remodel plate boundary, it used to be for far of the Mesozoic and early Cenozoic a part of a convergent plate boundary.


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Additional resources for Geology of San Francisco and Vicinity: San Francisco Bay Region, California: July 1-7, 1989

Sample text

Llll 124' 100 Km I are ascribed to wrench tectonics. 122' I 120' %'............ Abbreviations: G, GabilanRange;LP, the SalinianBlock andwhichareprecludedthereby the La PanzaRange;PA, Point Arena; PR, Point Reyes; SAF, San Andreas fault; SC, Santa Cruz Mountains; SE, "SoutheastemBlock"; SF, San Francisco;SL, Santa Lucia Range;SNF, Sur-Nacimientofault. presenceof mid- and upperCretaceousplutons. Stronenvironment,but new data suggestwidely uniform tiumisotoperatioscorroborate thecontinental affinities depositionacrossthe SalinianBlock by latestCretaceous (Kistler and Peterman, 1973).

The new boundarywas necessarily a transform,sincethetrendof themargin wasroughlyparallelwith therelativemotionvector. A long segmentof theproto-SanAndreasfault alongside the Salinian Block in west-central California was reincarnatedas the modem SAF; it and other faults comprised a dextraltransform plateboundarythatwas eventuallyexposedon land. FIGURE 12 Plate-tectonic settingof theSanAndreas fault,adaptedfrom theconceptsof Atwater(1970). Largearrowdenotesrelativeplatemotion,P:NA, at the plateboundary,lat.

To rise, and (2) What mechanismsand structureswere instrumentalin the uplifts. Comparablequestionsare posedby the structuralvalleys. SeveralpossibleexplanFIGURE 18 Stratigraphic panelacrosstheEastBay ationsof the rangeshavebeenproposed,but few (Berkeley)Hills fromtheCaldecottrunnelto thevicinity hypotheses havebeenspelledout in detail. Some of Mt. Diablo,showinginterf'mgering relationships of explanationsinvokehorizontalNE-SW compression theContraCostaGroupwith the SanPabloGroup. (favoredhere), othersproposeNE-SW extensionand Reproducedfrom Grahamet al.

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