Landslides on Puerto Suello Hill (Lincoln Hill) have been falling for decades. Marin IJ Report from 1963

SAN RAFAEL, CALIFORNIA, FRIDAY. MARCH 29, 1963  San Rafael  MUD SLIDE—A bulldozer was being used today to clear mud away from an unoccupied duplex apartment where a slide piled dirt up to the eaves yesterday. 

Rain Slacks Off A Little, But Mud Slides Start In Mud slides began in Marin County yesterday as a three- day rain storm, which slacked off to spring showers today, began to take its toll. The forecast was for showers through tomorrow with the chance of rain 60 per cent. Snow was predicted for the northern Sierra with cloudy weather in the south. Several large boulders fell from the northern slope of Puerto Suello Hill onto the Lincoln Avenue exit from Highway 101 in San Rafael at about 7:30 p.m. yesterday. Traffic had to be routed around the boulders by the California Highway Patrol. 

Mudslide splits home in two on February 6, 2017 in San Rafael, CA