Regarding potential future questions for the C's, linked below is an ancient archaeological mystery that perhaps they could shed some light upon. No one knows what these things are, and academia has claimed they are "natural formations" because these (clearly artificial) formations are thousands of years old and upset the accepted timeline:
Popular Archeology - The Mystery of the Tumuli
Over 400 mounds on New Caledonia in the southwest Pacific may mark a human presence predating the current earliest generally accepted dates by thousands of years.
popular-archaeology.com