Geology Subject Geology and geography of the Georges River Archibald Liversidge: Imperial Science Under the Southern Cross Clarke Medal Hawkesbury sandstone Quaternary sediments Wianamatta shale Branagan, David Francis Clarke, William Branwhite Cotton, Leo Arthur David, Edgeworth Etheridge, Robert Liversidge, Archibald Mawson, Douglas Strzelecki, Paul Edmund de Georges River near its source, Cataract Scout Camp 2015 Georges River, looking downstream from East Hills Park across flat floodplain 2014 Sandstone in Pirrama Road, Pyrmont 2006