In the Blue Mountains to the west of the city the townships keep to the central plateau and north and south there are enormous thickly forested valleys with sheer cliffs … panorama. Being a landscape of ancient tropical seabeds there are coal seams here and small scale mining went on until the 1930s. Mining is blamed for the landslide you see here — where a large hunk of cliff tumbled into the valley in the middle of the night in early 1932. For a year crowds gathered at a large crack in the cliff top hoping to see some action but in the end it fell unwatched.