Science & Technology - Posted by Sean Bettam-Toronto on Tuesday, November 20, 2012 16:04 - 0 Comments
Spears with stone tips used 500,000 years ago
U. TORONTO (CAN) — Human ancestors used stone-tipped weapons for hunting 500,000 years ago, about 200,000 years earlier than previously thought.
Attaching stone points to spears—known as “hafting”—was an important advance in hunting weaponry for early humans. Hafted tools require more effort and foreplanning to manufacture, but a sharp stone point on the end of a spear can increase its killing power.
“This changes the way we think about early human adaptations and capacities before the origin of our own species,” says Jayne Wilkins, a PhD candidate in the Department of Anthropology at the University of Toronto and lead author of a new study in Science.
This is a ~500,000-year-old point from Kathu Pan 1. Multiple lines of evidence from a University of Toronto-led study indicate that points from Kathu Pan 1 were used as hafted spear tips. Scale bar = 1 cm.
(Credit: Jayne Wilkins)
Straight from the Source
“Although both Neandertals and humans used stone-tipped spears, this is the first evidence that the technology originated prior to or near the divergence of these two species.”
Hafted spear tips are common in Stone Age archaeological sites after 300,000 years ago. This new study shows that they were also used in the early Middle Pleistocene, a period associated with Homo heidelbergensis and the last common ancestor of Neandertals and modern humans.
“It now looks like some of the traits that we associate with modern humans and our nearest relatives can be traced further back in our lineage,” Wilkins says.
Wilkins and colleagues from Arizona State University and the University of Cape Town examined 500,000-year-old stone points from the South African archaeological site of Kathu Pan 1 and determined that they had functioned as spear tips.
Point function was determined by comparing wear on the ancient points to damage inflicted on modern experimental points used to spear a springbok carcass target with a calibrated crossbow.
This method has been used effectively to study weaponry from more recent contexts in the Middle East and southern Africa. The stone points exhibit certain types of breaks that occur more commonly when they are used to tip spears compared to other uses.
“The archaeological points have damage that is very similar to replica spear points used in our spearing experiment,” says Wilkins. “This type of damage is not easily created through other processes.”
The points were recovered during 1979-1982 excavations by Peter Beaumont of the McGregor Museum. In 2010, a team reported that the point-bearing deposits at Kathu Pan 1 dated to ~500,000 years ago using optically stimulated luminescence and U-series/electron spin resonance methods. The dating analyses were carried out by Naomi Porat, Geological Survey of Israel, and Rainer Grün, Australian National University.
Funding for the research was provided by the Social Sciences and Humanities Research Council of Canada, the National Science Foundation and the Hyde Family Foundation. Logistical support came from the South African Heritage Resources Agency and the McGregor Museum, Kimberley, South Africa.
Source: University of Toronto