Possible 13,800-year-old
fishing weir found in ocean near B.C.'s Haida Gwaii islands
Researchers using a robotic underwater vehicle off British Columbia's
northern coast believe they may have found the earliest evidence
of human habitation in Canada.
Unfortunately, the site that could date back almost 14,000 years
lies beneath hundreds of metres of water in the ocean around the
Haida Gwaii archipelago.
¦LISTEN | Underwater
archaeologist talks about Gwaii Haanas trip
Archaeologist Quentin Mackie from the University of Victoria
and his team returned earlier this month from a research trip to
the archipelago, where they used the autonomous underwater vehicle
to scan the sea floor in search of evidence of ancient civilization.
"We're
not quite ready to say for sure that we found something," he said.
"We have really interesting-looking targets on the sea floor that,
as an archeologist, they look like they could be cultural."
Mackie has studied the area for 15 years and came to believe
that ancient residents would have harvested salmon near the coast
of what was then a single island that stretched well across Hecate
Strait toward the mainland.
At the time, the sea level was about 100 metres lower than it
is today and the main island of the archipelago was twice as large.
Stone tools or evidence of campfires would not be possible to
see on the ocean bottom: they're too small, Mackie said.
"But we had this idea that if people were harvesting salmon
in the rivers... they might have been building fish weirs," he said.
Armed with detailed scans of the sea floor and with the help
of Parks Canada and its research vessel, Mackie and his colleagues
set out to search.
For as many as 12 hours a day for 10 days, the torpedo-like
AUV used sonar to survey 25 kilometres of what were once riverbeds.
He's far from certain, but Mackie is hopeful the images show
at least one stone weir a man-made channel used to corral
fish. The scan suggests a wall of large stones was placed in a line
at a right angle to the stream, a fishing technique used by many
other ancient cultures, including those that thrived along B.C's
coasts.
"That's
pretty much the exact archetype of what we were looking for," he
said.
Based on radiocarbon dating from another archeological site
on the island, the weir could date back 13,800 years.
Alison Proctor, a research engineer from the university's ocean
technology lab, programmed and operated the AUV for this expedition
and during the 2012 search for the Franklin expedition in the Arctic.
She agreed there was nothing definite about the apparent find,
but "it gives us a reason to go on... go back and try to prove something
conclusively," she said.
Theory matches oral histories
A geologist will now study the images to ensure the
rocks are not a natural formation, then the team will return next
summer to take samples of the sediment near the site and to look
for stone tools.
Ernie Gladstone, the superintendent of Gwaii Haanas, said such
research helps Parks Canada and the Haida manage the land and sea
of the archipelago, which includes a UNESCO world heritage site
at SGang Gwaay.
Mackie's theory matches up with the oral history of the First
Nations, Gladstone said.
"We know that people have lived in the Gwaii Haanas area for
many thousands of years," he said.
But "much of the very early history of Gwaii Haanas and Haida
Gwaii lies below the waters of Hecate Strait."
If the current exploration site pans out, it's a testament to
the incredible resilience of the Haida, Mackie said.
"The village that you were born in would be underwater by the
time you died," he said. "And they're able to take all this change
in stride, and they probably even thrived on that."
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