Australia: The Land Where Time Began
A limestone rock shelter on the Murray River, South Australia. A slab with a petroglyph was found 3-4 m below the surface at this site. charcoal from the occupation layer has been dated to 3,000 years ago, but the date when the slab was carved, while it was part of the wall, is unknown.
Josephine Flood, Archaeology of the Dreamtime, J. B. Publishing
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