San Bruno — a chronology

San Bruno’s size increased to six square miles and close to 5,000 population by the 1940s.

Early geology history: Twenty-thousand years ago, the area was affected by ice age — ocean dropped 300 feet; it was dry to Farallon Islands to west; small San Jose River in middle of Bay. There was a land bridge from Asia to Alaska; migration was on land and sea. Glaciers melt about 20,000 years and, from 4,000 to 5,000 years ago, man (Indians) began migrating into the Bay as water from glacial melt filled the valley to east of San Bruno and forms the Bay. Indians found climate mild with plenty of food and a bountiful Pacific Coast flyway for migrating birds.

Biodiversity and overview of early times: Bears, coyotes, ducks, steelhead trout, mussels, clams and seeds were abundant so the Indians became gathers and migrated from the Bay side to the hills to the west as the season afforded food. They developed no written language. They lived in tule (reeds) huts that lasted one year before they rotted and became unlivable. The huts were rebuilt the next year. They did not build any adobes, etc.

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