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Inman Valley, The District Council of Yankalilla, South Australia, 5211, Australia (-35.49480 138.45747)
In the valley is Selwyn Rock (35°29′47″S 138°30′45″E / 35.4965°S 138.5124°E / -35.4965; 138.5124) a glaciated pavement in the bed of the Inman River. It was first described in 1859 by, and later named for, A.R.C. Selwyn, who was Victorian Government geologist at the time. Glacial grooves and striations on the polished surface indicate glacial movement to the north-west. Boulder clays, tillites and erratics are also common in the area, which underwent glaciation during the Permian (approximately 270 Ma). The pavement was exposed during the Tertiary when the Inman River eroded the topography to its present-day surface. A cafe overlooks the glaciated bed of the river, with access onto the rock available via stairs and viewing platforms.