I'm not sure what the pros have come up with, but here is my understanding of some of the past ID conventions. Obviously, the ideal is to find a pile of stones in the gut area of a complete skeleton. Of course, gastroliths were apparently periodically expelled as vomitus, so piles without a deceased donor exist. It is my understanding that ID takes into account - the presence of stones not present in the local area; a worn, smoothed appearance with a "silky" luster and unpolished low areas on th
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