I was being a bit of a smart ass when I wrote "litter archaeology." But then, after a five mile hike, a nap, and lunch, I thought, "You know, the artifacts archaeologists dig up are usually the trash of past civilizations. Shattered pots, broken tools, discarded household items..."
So I've reworked my opinion of the stuff scattered—or piled—around me in the desert. It's a treasure trove for future archaeologists. Especially if they're studying the history of beer.