Eastern panorama, as seen from Sitting Bull
Geology
The crest of Sitting Bull is a pegmatite outcrop occurring in the neoproterozoic sedimentary rocks, members of a series of pegmatite plugs, together with the pinacles, following a west-north-west direction along Arkaroola's southern boundary. The intruding pegmatites have metamorphosed the surrounding calcareous sediments to produce actinolitic skarns containing a variety of accessory minerals [mindat].
A pegmatite is a holocrystalline, intrusive igneous rock composed of interlocking phaneritic crystals usually larger than 2.5 cm in size; such rocks are referred to as pegmatitic [wikipedia].
A scientific characterization of the regional pegmatites as evidence for a magmatic-hydrothermal transition in Arkaroola has been published by Bakker and Elburg, 2006.
Access
Best access to the crest is from its western side, which you reach directly from the pinnacles' car park, or via the hiking trail along Mawson Valley. Once you reach the pegmatite outcrops, the tour becomes a balancing act, rock-hopping run, or a bouldering exercise, depending on your skills and fitness.
Location
Under a dip west of the eastern highest point of Sitting Bull.
South view of Sitting Bull