The Sarita River limestone showing outcrops on the river, 2.5 kilometres east of Numukamis Bay on the west side of Barclay Sound. Limestone of the Upper Triassic Quatsino Formation (Vancouver Group), up to 750 metres wide, extends westward for 2.5 kilometres along the Sarita River. The deposit is bounded to the east, west and south by mafic volcanics of the Upper Triassic Karmutsen Formation (Vancouver Group). The limestone is in fault contact with Lower Jurassic Bonanza Group volcanics to the north.