Head NE from hideaway biv towards the obvious erosion channel caused by water and walk up either side of it to gain a flat ridge. Continue following the flat ridge NE until you hit a scree climb upwards. Eventually the screen changes from gravel to foot sized rocks. Head towards the rocky outcrop for the summit. Note: Stony Peak is not actually as high as the point a few hundred meters to the north over easy ground, but it is actually the correct name and place. Consult a topo map for clarification.
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