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1. Structures and History from Rocks

1. Structures and History from Rocks - Geologic Structures...

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1 Geologic Structures Tectonics at work: •Folds •Faults Geologic Structures Tectonics at work: •Folds •Faults anticline syncline anticline Vertical beds Anticline monocline
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2 Plunging Anticline Types of Faults Fig. 2a. Fault cross sections (vertical movement) Fig. 2b. Map view (looking down) of lateral fault Right lateral fault Normal fault extension Reverse fault compression Clues for Recognizing Faults 1. Abrupt changes in topography by vertical movement 2. Preferential erosion of fault zones (linear valleys) 3. Offset rock units, streams, or other linear features 4. Aquifers truncated, so groundwater surfaces 5. Abrupt changes in rock types, recognized by rocks exposed, vegetation patterns, differential erosion, etc. Offset stream SA Fault/canal
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3 Malibu Fault Owens Valley JPL/Sierra Madre Fault Southern California 101 Fwy SFO
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4 Tomales Bay Carrizo Plain 1857 scarp Pallet Creek San Andreas/gw surfaces Inyo Times 1872
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5 1906 Stanford pancake 1906 SF Fires 1906 Horses 210Fwy/1970 San Fernando house
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