 Other ultramafic occurrences include the Cape Sorell and Serpentine Hill Complexes.As part of this collision, three exotic suites of basalt were tectonically introduced into the Dundas Block.Near Waratah is a sub-alkaline basalt from an ocean floor, another is a high-magnesium andesite-basalt with chrome spinel and clinoenstatite named boninitic rock after the Bonin Islands.