Posner, a prolific ultramarathoner currently in training for a 200-mile race in Vermont this year, wanted to broaden the scope of distance running and walking by opening the time frame for Rock the Ridge to 24 hours.

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Our planned route took us, over two nights and three days, from the rustic Wild River Campground, along Meader Ridge, over the rock-strewn Carter Dome and along winding trails skirting Moriah Brook and Wild River back to our starting point.

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As details of Sharp's death became public it emerged that 40 climbers had passed him, making no attempt to save the stricken climber as he lay stranded in the scant shelter of a rock alcove on the mountain's northeast ridge.

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The trail along the mountain ridge led us past an extraordinary white rock that jutted out from the hillside, looking like a huge, triangular, diving platform.

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We head uphill, across crumbly volcanic rock through a narrowing defile that rises to the top of a ridge.

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It takes its name from the huge, red rock that stands aloof in the desert, towering above a narrow ridge that points towards it like an arrow.

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