Should add, hope your camera has a panorama mode or at least some software to stitch photographs together.
Regarding water - places that do have water it is usually bore water and has a high mineral content. The swimming pool at Arkaroola, apart from being cold is also hard water (could almost bounce off the top) and using the showers there do not expect a lather to form
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Regarding Brachina Gorge, there is a geological trail with lots of signs which takes in a large part of the geological history of the region. There is also a "gold spike" there regarding a specific reference to a specific geological age - i.e. a geological reference/datum point. That is from memory so others probably can clarify further.
Enjoy, tis a great place.