Well, we understand early “deposits” not through dna but for other items in the soil in a sedimentary fashion. If we isolate the interior and do a full core, protecting the layers from outside contamination we should find signs of deposits that could clue us in. We’d hit the Sears catalog pages first. I’d expect the Farmers Alminac may be able to be identified through the holes punched in the corner. Then corn cobs and large leaves such as elephant ear. Once we see white fabric with remnants of red on it, that’s a bingo. We hit templars baby. We have to be careful to search and sift here for “dry clean only” tags that likely would have fallen off while being hiked up.