Part 2 - Evolution basin
Looking south @ Evolution lake & the beginning of the basin from the outlet

Looking north back towards Evolution valley

Cue GoT: winter is coming

Unnamed drainage between Sapphire & Wanda

It had taken Andy & I over six hours to cover just 5.5 miles from upper Lamarck plateau, over the col, through Darwin canyon, and then down the bench to the JMT. The slow time hints at the difficulty, but doesn't really reveal how much physical exertion was necessary to make this short distance. We were both pretty worked, so when we pulled up around 1pm (after starting @ 6:30am) at a warm, sunny clearing along Evolution creek, we were happy to drop everything and take a break.
We also needed to dry out our gear, since we had picked up significant condensation & frost from the night before. As it turns out, this would be a recurring pattern - the weather was so perfect, the skies so clear, that we never wanted to put up shelter. As a result, we just dealt with wet gear until we had a chance for an afternoon dry out session. The way the overall hike plan was constructed, we we would be hitting the high passes early each morning, but would be reaching the hot low points each day around noon. Perfect for drying out gear & resting a bit, but terrible for getting back on the horse in order to re-gain the necessary elevation in preparation for the next day's pass.
The second day's mileage plan was fairly modest - only 12 miles. But it had required first a 12.9k pass, and now a 12k pass, all over snow. From our sunny perch, we knew we had to cover another 6.5 miles. We figured we could average around 1.5mph, so by leaving by 2:30pm, we expected we could reach the Muir hut sometime before 7pm.
Unfortunately, nature often has other plans, and in this case, if we had thought we were post-holing a little bit (off-on) through Darwin canyon, Evolution basin was about to serve up a major portion of post hole whoop-ass. It should be emphasized that we knew this going in - there were 3 different kinds of conditions we were expecting and had trained for in preparation of the physical demands: hard packed snow, semi-soft snow, and hot exposed canyons. It was just the nature of the trip that we were going to experience post-holing later in the day .
Well, all I can see is thank goodness I had my heavy OR knee-high gaiters.