But hey, more time for photographs, right? Trailside cycle of life.
On the trail uphill, water apparently was running down the trail from no particular source. On closer inspection, I could see grains of sand and mica bubbling up as water was apparently coming out of the ground. A tiny spring in the trail.
Around this point on the midway point descent, I realized that this rather stout 7-miler had become a relaxed run for a day of moderate effort, and I like that.
If you have to skid on flats like this, you are probably out of control. It's the same for all mountain sports: biking, skiing/riding, running... if you are skidding, you need to slow down.