Ultramafic member
Ultramafic member
Early Jurassic and Late Triassic, ~193-209 Ma
Serpentinite-matrix mélange, with blocks of amphibolite, plutonic rock, and volcanic rock like that of other members, and tectonized harzburgite, plus, quartzite (metachert?), argillite, and chert like that of the structurally underlying Clipper Gap Formation (unit YACG) (tectonically inmixed?).