Serpentinized peridotite, possibly of the President Ultramafics (probably correlative with Permian and older Shulaps Ultramafics), occurs in a large body against granodiorite of the Jurassic to Tertiary Coast Plutonic Complex.
Excellent quality cross fibre crysotile asbestos occurs in closely spaced veinlets 3 millimetres wide in 30 centimetre widths of partly serpentinized peridotite.