As I have posted many times is that lack of evidence is not evidence of lack. The mere existence of a ground edge ax tells us that that particular ax most likely had ten millennia of prehistory that we do not see. That is also ample time for the method to travel throughout the old world.
Thus ground edged axes were in use possibly for as much as fifty thousand years if not a great deal longer. Their limited utility may not have made them part of every tool kit. They may have been specialized for say producing dugout canoes. The North West Indians used a neat reverse adze for just that purpose.
All of which would not make them too common in the archeological record.
We are slowly learning to quit underestimating our stone age cousins who made do with a sharply lower knowledge base in terms of materials but not lower ability to imagine and innovate with what little they had.
Recall that with so little they occupied very habitable valley and land mass on Earth.
World's oldest axe found in Australia
November 5, 2010
An ancient Aboriginal rock carving is seen in this photo taken on the Burrup Peninsula in the north of Western Australia
Archaeologists revealed they have found a piece of a stone axe dated as 35,500 years old on sacred Aboriginal land in Australia, the oldest object of its type ever found.
The shard of stone, found in Australia 's lush and remote far northern reaches in May, has marks that prove it comes from a ground-edge stone axe, Monash University
"We could see with the angled light that the rock itself has all these marks on it from people having rubbed it in order to create the ground-edge axe," he told the ABC.
"The person who was using the axe was grinding it against a sandstone surface in order to make it a smoother surface."
David said the previous oldest ground-edge axes were 20,000 to 30,000 years old, and the conventional belief was that the tool first emerged in Europe when populations grew and forests flourished at the end of the last Ice Age.
"What we've got in Australia
"What this all means is that we know that the conventional story that comes from Europe does not explain the origin of axes globally. So we've got to think of it in a very different way."
David said the discovery is evidence that Aboriginal Jawoyn people from Arnhem Land could have been the first to grind axes to sharpen their edges.
Nawarla Gabarnmang is the archaeological site in Jawoyn country from which the 35,000 year old piece of ground-edge axe was found. Credit: Bruno David
"It means that you're creating a tool that is far more efficient than what you had before, and that you also have to create a tool not just through a simple series of actions of hitting against it," he said.
The piece of stone was found in a remote patch of the Northern Territory
"It's a very remote location, it's quite a spectacular site that is covered in rock art," David said, adding that the cave where the stone was found was well protected from the elements.
Jawoyn Aboriginal people, who had invited the archaeologists to their land to examine the site, said the find was a meaningful connection to their ancestors.
"They (the archaeologists) study about rocks and bone and everything and I wanted to know the truth," landowner Margaret Katherine told the ABC.
"Now that I know the truth I am very happy deep inside."
Arnhem Land, a 97,000 square kilometre (38,800 square mile) patch of forests, rivers and gorges east of the Northern Territory capital of Darwin
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