This stuff? Been there at least since early 2014
Since May of 2012, Jim and I were probably some of the first few to come across it I imagine judging from some dates on the bread and other perishable items that were dated about two weeks before we came across the scene.
Whoever the horseman was who went through here, had a bad time, one horse clearly came up lame and there was evidence of some distress, including a few arrows drawn in the ground, messages to another person in the group, more gear further down Frog tanks and some medical supplies used to treat and injured animal. Our theory was, all gear was dropped off one horse to get it out safely or alive and the guy walked out with horse, or rode another one out..We repacked all the gear and set on the large boulder beside trail, thinking he would come back for it, but alas that has never happened...