OZIEBSTER 1956 JOURNAL APR 28 POINT ISABEL, CONTRA COSTA CO., CALIF. (CONT) TO A DEPRESSION 5 INCHES WIDE X 3 INCHES DEEP. WITH A HOLE AN INCH & A QUARTER IN O/D. LEADING OUT OF THE SIDE OF IT. NO CAVITY NOTICED IN THE CENTER BUT NO IT LOOKED LIKE ON OLD PILE OF GRASS THAT MIGHT HAVE JUST FALLEN IN IF IT WAS ONCE A NEST. SEVERAL SMALL FEATHERS WERE IN RUNWAYS LEADING TO TOP PORTION OF GRASS. ALSO TOP VIEW UNDERGROUND RUNWAY GRASS RUNWAYS ON SURFACE SIDE VIEW PLANK VOMUS COENIA RUNWAY RAT SYSTEM GRASS PILE