AKSAR, thanks for the reference! But I beg to differ with the headline writers - that's not trash, those are priceless artifacts (definitely, one man's trash is another's treasure..)
Kind of like the old saying in geology: "One man's basement is another man's overburden." Similarly, I know some USGS guys working down on the Kenai were ecstatic about how the very recent retreat of a glacier had perfectly exposed some bedrock, and because the glacier retreated so fast and so recently, all that green vegetation crap hadn't yet grown in to obsure the outcrop.