R H Matthews, a surveyor/ethnographer, records a rock shelter on left bank of Hawkesbury river near Sackville Reach. He writes “the roof is much blackened and begrimed by soot of camp fires; and judging from this …probably been the haunt of Aborigines for several generations.”The paintings in the cave had 42 hand stencils 1 boomerang all stenciled in white ochre. Mathews records Darug language with three or four of Nanny’s children.