The Customs and Traditions of the Aboriginal Natives of North Western Australia by John G. Withnell

They have very many rock carvings; every hill that has suitably hard stone will have some kind of figure tattooed thereon. They do not choose the softer rocks, and mainly prefer the basalt and granite. The method adopted is to draw the outline with chalk or ochre and with a sharp hard stone hammer within the outline until the rock is fretted away about one-eighth of an inch deep. Some of the figures are very large, whilst others are small. None of the outlines show much aptitude for drawing. The head is round, then a straight line much smaller than the head represents the trunk of the body. A slighter line on each side represents the arms, with a bend for the elbow, and a large ball at the end of each of these line, represents the hands. Each leg is the same size as the body, with enormous feet, the whole being greatly out of proportion. Some, however, are done a little better, but others so badly that they require explaining. The carvings are mainly representative of men, kangaroos, rats, opossums, emus, turkeys, fishes, spears, shields, native weapons of all kinds, and many men and women in a variety of vulgar attitudes.