D'Urban's group, distant 150 miles lower down the Darling, consisted of a Quartzose rock, exactly similar to this, exhibiting a tendency, like it, to break into irregular polygons, some of the faces being curved.
"Journal of an Expedition into the Interior of Tropical Australia In Search of a Route from Sydney to the Gulf of Carpentaria (1848) by Lt. Col. Sir Thomas Livingstone Mitchell Kt. D.C.L. (1792-1855) Surveyor-General of New South Wales"
Thomas Mitchell
When they consist entirely of quartz, the rock becomes Quartzose.
"Geology"
James Geikie
17. What is a Quartzose conglomerate?
"Geology"
James Geikie