The "Intrusive Rocher-Quenonisca Suite" includes the Whitefish Intrusion (nAwf) that outcrops mainly between lakes Quenonisca and Rocher (NTS sheets 32K09 and 32K10), Rocher Intrusion (nAlrc) and another small peridotite intrusion of less than 15 kilometers in diameter that cuts the paragneisses of the "Rock Complex" (nAroc) and the migmatitic gneisses of the "Bétulaie Complex" (nAbtu) in the area of Rocher Lake (NTS sheet 32K09).