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Ohlone Indians and Early Spanish explorations of the San Francisco Peninsula. A presentation by Mark G. Hylkema, State Parks Archaeologist. In 1769, the first Spanish land expedition in California inadvertently discovered San Francisco Bay. They encountered numerous tribal communities that lived in a bountiful landscape but could not know that the mosaic of tribal communities had adapted to several major environmental transitions over a period of at least 12,000 years. Archaeological research has found that tribes spread along the San…Find out more »