Enter the nature park from Christmas Street. Walk from the sign designating the park towards two eucalyptus trees to find aboriginal artifacts. This southern section of the Tuggeranong Valley contains a large flat area of exposed sandstone rock with some 50 shallow grooves worn into the surface. These were used by the Aborigines to grind stones into sharp edges for use as axes. The water needed to lubricate the grinding process came from Tuggeranong Creek. The creek flows below the site on the other side of the Monaro Highway.