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| Timeline of the San Francisco Bay Area ： ウィキペディア英語版 |
Timeline of the San Francisco Bay Area
This is a timeline of the San Francisco Bay Area in California, events in the nine counties that border on the San Francisco Bay, and the bay itself.
*''An identical list of events, formatted differently, may be found here''
==Prehistory==
*The San Andreas Fault ''(pictured)'' begins to form in the mid Cenozoic about 30 million years ago
*9.5 million years ago, the Moraga Volcanics produces most of the lavas that underlie the East Bay ridges from present day Tilden Regional Park to Moraga
*During the Quaternary glaciation beginning 2.58 million years ago, the basin that will be filled by the bay is a large linear valley with small hills, similar to most of the valleys of the Coast Ranges. The rivers of the Central Valley run out to sea through a canyon that will become the Golden Gate. As the ice sheets melt, sea levels rise over the next 4,000 years, and the valley fills with water from the Pacific.
*Evidence of human occupation of California dates from at least 17,000 BCE.
*The Ohlone people ''(pictured)'' inhabit the Bay Area region as early as 6,000 years ago, with a 1770 estimated population of 10,000–20,000
*The Coast Miwok inhabit the Sonoma region as early as 4,000 years ago, with a 1770 estimated population of 2,000
*The Patwin people inhabit the northern Bay region as early as early as 1,500 years ago, with a 1770 estimated population of 12,000
*The Bay Miwok inhabit the region that is now Contra Costa County, with a 1770 estimated population of approximately 1,700
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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