"So may I ask what constitutes the information that indicates prehistoric provenance. A photo? Fieldnotes? IMO these don't prove a thing."
You seem to be looking for certainty - prehistoric or not prehistoric. But that's unachievable in a lot of cases, they're "maybes" of differing degrees. So what's wrong with what's offered - add an argument in favour and leave it to the Eds to be persuaded or otherwise. Seems like the only practical approach to me.
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