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A timeline of significant geological events in the evolution of Western North America. Dates are approximate. ("Ma" = millions of years ago)
The Sonomia Terrane collides and accretes to the North American Plate, along a line called the Golconda Thrust (also the name of the event) which runs through central Nevada.
The Smartville Block, an island arc terrane, collides and accretes to the North American Plate, along a line which coincides with the Mother Lode country of California.