Here is another story about the DNA extraction from Ancient wads of chewed yucca fiber in the US southwest. This one is a National Public Radio story that aired last Friday.
In it, the researcher LeBlanc, speculates on the information that would have been lost if these modest wads of chewed fiber had been thrown out as unimportant. These quids were collected over 60 years before DNA was even discovered, let alone could be used as a tool in the way it is now. Modern archaeologists routinely collect and store large volumes of what may seem the merest trash. There is a major discussion in the field right now about what ought to be saved from digs.
Something is not right. This message is just to keep things from messing up down the road