The traditional owners, the Bunaba, call the gorge Darngku. Stories of how the park was created in the 'Dreaming' can be heard on a boat tour giving visitors an Aboriginal perspective of the park and its plants and animals.
The gorge features steep walls where the river has cut through the Geike Range, exposing a fine section of the Devonian Reef. It is 14 kilometres long, divided into two sections of approximately equal length with several atoll-type reefs in the Copley Valley area.
The 30 metre high walls are bleached white by sun and water to a height of about 10 to 12 metres above normal river level and fossils embedded in the limestone may be seen. Most of the gorge in its southern part is cut through back-reef limestone while to the north the river slices through marginal slope deposits which contain some conspicuous bivalve shells. The contact between steeply inclined marginal-slope deposits and horizontally bedded reef and back-reef deposits are well illustrated two kilometres south of sheep camp yard.

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