 The Collingwood area experienced the highest grade of metamorphism with garnet-mica schist, mica schist and garnet-mica-kyanite gneiss present, and enough heat to form veins of migmatite.Eclogite and garnet amphibolite are believed to be the remains of basalt.The eclogite has been heated to 700° at 1520 MPa, a burial depth of perhaps 50 km.