A clear rock painting in Ginga Wardelirrhmeng , on the northern edge of the Arnhem Land plateau , from the freshwater period ( that was begun 1500 years ago ) shows a didgeridoo player and two songmen participating in an Ubarr Ceremony .
A rock painting in Ginga Wardelirrhmeng , on the northern edge of the Arnhem Land plateau , dates from the freshwater period .