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      • Today, the Pacific Plate is slowly creeping north past the North American Plate, forming the San Andreas fault system. San Francisco Bay was created by movement on these faults about 650,000 years ago.
      www.nps.gov/prsf/learn/nature/geologicformations.htm#:~:text=Today, the Pacific Plate is slowly creeping north,movement on these faults about 650,000 years ago.
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  2. San Francisco Bay - Wikipedia

    en.wikipedia.org/wiki/San_Francisco_Bay

    San Francisco Bay is a shallow estuary in the US state of California. It is surrounded by a contiguous region known as the San Francisco Bay Area, and is dominated by the large cities of San Jose, San Francisco and Oakland. San Francisco Bay drains water from approximately 40 percent of California. Water from the Sacramento and San Joaquin rivers, and from the Sierra Nevada mountains, flow into Suisun Bay, which then travels through the Carquinez Strait to meet with the Napa River at the entranc

    • United States
    • Pacific Ocean
    • 19 km (12 mi)
    • 400–1,600 sq mi (1,000–4,100 km²)
  3. Geologic Setting - Presidio of San Francisco (U.S. National ...

    www.nps.gov/prsf/learn/nature/geologicformations.htm

    Feb 28, 2015 · The geology you see around San Francisco is the result of forces along the Pacific and North American plates. Today, the Pacific Plate is slowly creeping north past the North American Plate, forming the San Andreas fault system. San Francisco Bay was created by movement on these faults about 650,000 years ago.

  4. Geology of the Golden Gate Headlands

    www.nps.gov/goga/learn/education/upload/Geology...

    Although the valley in which San Francisco Bay resides probably began to form 2 to 3 million years ago, when the surrounding mountains and hills started to rise on either side, the first known estuarine (marine influenced) rocks were laid down only about 600,000 years ago, as dated by the Rockland ash bed which overlies the earliest marine rocks (Sarna-Wojcicki; pers. comm., 2001).

  5. San Francisco Bay | bay, California, United States | Britannica

    www.britannica.com/place/San-Francisco-Bay

    San Francisco Bay, large, nearly landlocked bay indenting western California, U.S. It is a drowned river valley paralleling the coastline and is connected with the Pacific Ocean by a strait called the Golden Gate, which is spanned by the Golden Gate Bridge. San Francisco Bay is 60 miles (97 km)

  6. Geologic Trips San Francisco and the Bay Area

    www.geologictrips.com/sf/sfttff.pdf

    The sand at Ocean Beach and in the sand dunes of northern San Francisco is really a relic, a gift from the past. These sands were deposited along the western shoreline of the San Francisco peninsula during the Wisconsin glacial period, from 10,000 to 15,000 years ago, when sea level was low and the Sacramento River flowed through the Golden Gate.

  7. New Maps Reveal Seafloor off San Francisco Area

    www.usgs.gov/news/new-maps-reveal-seafloor-san...

    May 21, 2015 · The new “Offshore of San Francisco” maps document the complex submarine environments along the inlet to San Francisco Bay formed by strong tidal currents, including spectacular sand waves, a deep scour pool beneath the Golden Gate, and the dynamic offshore San Francisco mouth bar and “Potato Patch” shoal. Sediment distribution maps reveal only a thin sediment cover offshore of the Ocean Beach (San Francisco) erosional hotspot (a pattern extending south to San Gregorio), indicating ...

  8. Sacramento–San Joaquin River Delta - Wikipedia

    en.wikipedia.org/wiki/Sacramento–San_Joaquin...

    The Delta was formed by the raising of sea level following glaciation, leading to the accumulation of Sacramento and San Joaquin River sediments behind the Carquinez Strait, the sole outlet from the Central Valley to the San Pablo and San Francisco Bays and the Pacific Ocean. The narrowness of the Carquinez Strait coupled with tidal action has caused the sediment to pile up, forming expansive islands. Geologically, the Delta has existed for about 10,000 years, since the end of the Last Glacial P

  9. Worst erosion in 150 years tears 180 feet from SF's Ocean Beach

    www.sfgate.com/science/article/Scientists-detect...

    Feb 14, 2017 · 1 of 22 Maurice Green jumps off of a small bluff at Ocean Beach in San Francisco, California, on Tuesday, Feb. 14, 2017. Gabrielle Lurie/The Chronicle Show More Show Less 2 of 22. Patrick Barnard ...

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