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A Nineteen Seventies Race In Marin Launched A Nationwide Mountain Biking Pattern MARIN COUNTY, CA — On Oct. 21, 1976, a small group of cyclists and a canine named Junior gathered on Carson Ridge, which rises simply west of Fairfax. It was midmorning and the sky was brilliant blue, a gorgeous day for racing 50-pound classic Schwinn Excelsior clunkers down Cascade Canyon Highway, whose winding dust floor plunges 1,300 ft in lower than two miles, previous serpentine outcrops, low-lying chaparral, and scattered oaks on its method to the confluence of San Anselmo and Cascade creeks. Among the many bike riders…