 The ultramafic unit is a massive serpentinite, likely of mesocumulate to adcumulate composition.Peak metamorphic assemblages were in the amphibolite facies, with development of metamorphic olivine-anthophyllite-pyroxene assemblages.Retrograde metamorphism has occurred, leaving a serpentine-anthophyllite/cummingtonite-talc assemblage, with some areas of talc-carbonation.