Introduction -- Petrographic procedure -- Pearse Peak and related plutons -- Pearse Peak pluton -- Benson Creek pluton -- Granite Peak pluton -- Johnson Creek pluton -- Gray Butte and Lawson Creek plutons -- Iron Mountain pluton -- Miscellaneous plutons -- Sixes River Middle Fork pluton -- Game Lake Lookout pluton -- Collier Butte (extension) -- Rock in quarry on Johnson Creek road -- Lobster Creek-Boulder Creek metagabbro -- Summary and conclusions -- Petrology -- Age and correlation -- References.