Near the summit cairn of Great End is a craggy outcrop of claystone rock that looks fairly nondescript in broad daylight. Only on closer inspection can some streaks of colour be seen.
However after the sun has set the combination of just enough ambient light and a long shutter speed is enough to bring out the rich colours. The rock is predominently laminated volcaniclastic claystone. The blues and reds are minerals within the rock itself while the yellows and greens are lichen growing on the surface.
To read how I ended up on Great End read my blog entry about a night on Great End.