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Combining the radiocarbon dates with archaeological information revealed that early Neolithic activity, including the digging of pits, took place around 3,650BC.

The Antiquities Act of 1906 gives presidents the authority to designate monuments to protect “objects of historic and scientific interest” and can encompass geologic wonders, archaeological sites and wildlife habitat.

Several of those workers attended the protest at King Gillette Ranch, including Katie Preston, a park ranger who until Feb. 14 worked as an archaeological technician, surveying the land for natural and cultural resources.

Also, the "earliest evidence remains uncertain because many regions of the world have not been properly researched or archaeological evidence is known but has not been dated properly".

The discovery has been reported to the Treasure Trove Unit, which assesses all Scottish archaeological finds.