Small lethal tools have big implications for early modern human complexity


November 7, 2012

On the south coast of South Africa, scientists have found evidence of an advanced stone age technology dated to 71,000 years ago at Pinnacle Point near Mossel Bay. This technology, allowing projectiles to be thrown at greater distance and killing power, takes hold in other regions of Africa and Eurasia about 20,000 years ago.

When combined with other findings of advanced technologies and evidence for early symbolic behavior from this region, the research documents a persistent pattern of behavioral complexity that might signal modern humans evolved in this coastal location. These findings were reported in the article “An Early and Enduring Advanced Technology Originating 71,000 Years Ago in South Africa” in the Nov. 7 issue of the journal Nature. Pinnacle Point Download Full Image

“Every time we excavate a new site in coastal South Africa with advanced field techniques, we discover new and surprising results that push back in time the evidence for uniquely human behaviors,” said co-author Curtis Marean, project director and ASU professor in the Institute of Human Origins, a research center of the College of Liberal Arts and Sciences in the School of Human Evolution and Social Change.

The reported technology focused on the careful production of long, thin blades of stone that were then blunted (called “backing”) on one edge so that they could be glued into slots carved in wood or bone. This created light armaments for use as projectiles, either as arrows in bow and arrow technology, or more likely as spear throwers (atlatls). These provide a significant advantage over hand cast spears, so when faced with a fierce buffalo (or competing human), having a projectile weapon of this type increases the killing reach of the hunter and lowers the risk of injury. The stone used to produce these special blades was carefully transformed for easier flaking by a complex process called “heat treatment,” a technological advance also appearing early in coastal South Africa and reported by the same research team in 2009.

“Good things come in small packages,” said Kyle Brown, a skilled stone tool replicator and co-author on the paper, who is an honorary research associate with the University of Cape Town, South Africa. “When we started to find these very small carefully made tools, we were glad that we had saved and sorted even the smallest of our sieved materials. At sites excavated less carefully, these microliths may have been discarded in the back dirt or never identified in the lab.”

Prior work showed that this microlithic technology appeared briefly between 65,000 and 60,000 years ago during a worldwide glacial phase, and then it was thought to vanish, thus showing what many scientists have come to accept as a “flickering” pattern of advanced technologies in Africa. The so-called flickering nature of the pattern was thought to result from small populations struggling during harsh climate phases, inventing technologies, and then losing them due to chance occurrences wiping out the artisans with the special knowledge.

“Eleven thousand years of continuity is, in reality, an almost unimaginable time span for people to consistently make tools the same way,” said Marean. “This is certainly not a flickering pattern.”

The appearance and disappearance is more likely a function of the small sample of well-excavated sites in Africa. Because of this small sample, each new site has a high probability of adding a novel observation. The African sample is a tiny fraction of the known European sample from the same time period.

“This is why continued and well-funded fieldwork in Africa is of the highest scientific priority if we want to learn about what it means to be human, and where and when it happened,” said Marean.

The site where this technology was discovered is called Pinnacle Point 5-6 (PP5-6). This spectacular site preserves about 14 meters of archaeological sediment dating from approximately 90,000 to 50,000 years ago. The documentation of the age and span of the technology was made possible by an unprecedented fieldwork commitment of nine, two-month seasons (funded by the National Science Foundation and Hyde Family Foundation) where every observed item related to human behavior was plotted directly to a computer using a “total station.” A total station is a surveying instrument that digitally captures points where items are found to create a 3D model of the excavation. Almost 200,000 finds have been plotted to date, and excavations continue. This was joined to over 75 optically stimulated luminescence dates by project geochronologist Zenobia Jacobs at the University of Wollongong (Australia), creating the highest resolution stone-age sequence from this time span.  

“As an archaeologist and scientist, it is a privilege to work on a site that preserves a near perfect layered sequence capturing almost 50,000 years of human prehistory,” said Brown, who codirected excavations at PP5-6. “Our team has done a remarkable job of identifying some of the subtle but important clues to just how innovative these early humans on the south coast were.”

Research on stone tools and Neanderthal anatomy strongly suggests that Neanderthals lacked true projectile weapons.

“When Africans left Africa and entered Neanderthal territory they had projectiles with greater killing reach, and these early moderns probably also had higher levels of pro-social (hyper-cooperative) behavior. These two traits were a knockout punch. Combine them, as modern humans did and still do, and no prey or competitor is safe,” said Marean. “This probably laid the foundation for the expansion out of Africa of modern humans and the extinction of many prey as well as our sister species such as Neanderthals.”

The research team included coauthors Institute of Human Origins affiliated faculty research associate Erich Fisher and affiliated doctoral students Benjamin J. Schoville, Simen Oestmo, and Jocelyn Bernatchez; Panagiotis Karkanas of Ephoreia of Palaeoanthropology-Speleology of Southern Greece; and Thalassa Matthews of Iziko South African Museum.

Julie Russ

Assistant director, Institute of Human Origins

480-727-6571

Sports as a trope of American national identity


November 7, 2012

Editor's Note: This op-ed by Abigale Vercauteren is part of Title IX week at ASU – a celebration and examination of the 40th anniversary of the landmark piece of legislation that paved the way for equal opportunities in education and sports for women and girls.

As we celebrate the anniversary of Title IX, a component of the Education Amendments of 1972 signed into law by President Richard Nixon, it is important to critically reflect on the progress that has been made during the 40 years since its implementation. Download Full Image

Although Title IX protects against discrimination on the basis of sex “under any educational programs or activity receiving federal assistance,” it is most commonly referenced in regard to intercollegiate athletics.

Despite individual success stories – such as that of Ashley Martin, the first woman to play in a Division I college football game, or Gabby Douglas, the first African-American woman to win an individual all-around and team gold medal at an Olympic Games – Title IX continues to be a source of controversy. Underscoring such contention is the ongoing belief that mainstream athletics are intended to be participated in, and consumed by, (white, heterosexual, able-bodied) men. Women’s literal and cultural exclusion from athletics has become even more problematic in recent decades, as sports have become increasingly intertwined with U.S. national identity and belonging.

Just weeks before the terrorist attacks of September 11, President George W. Bush delivered a speech at the Little League World Series in which he described a childhood of “playing on those dusty little league fields in west Texas” and praised the “great sport of baseball."

In the days following the terrorist attacks, baseball was repeatedly invoked as a symbol of hope, resiliency and patriotism by athletes and politicians alike. However, narratives linking sports with American national pride extend beyond moments of national crisis. For example, the Dallas Cowboys, a member of the National Football League known for aggressive play and on-the-field antics, has been affectionately dubbed “America’s team,” while professional athletes have achieved near-celebrity status (and ever-expanding salaries) in recent years.

Meanwhile, the WNBA, one of the few professional leagues open to female athletes, is often openly mocked and delegitimized, and athletes such as Danica Patrick and Maria Sharapova are recognized more for their physical appearance than their athletic prowess. In fact, a recent article in Men’s Fitness magazine – titled "Hottest Female Athletes" – declared that “nothing makes the mercury rise quite like these sexy ladies, who make their sports look good just by being part of it.”

Although Title IX has undoubtedly resulted in significant gains for women – particularly in academia – athletics, as a whole, remains male-dominated and male-defined. While funding for women’s collegiate sports has increased as a result of Title IX, barriers remain for female athletes and others who do not fit the mold of “ideal sporting bodies.” For women’s athletic participation to be consistently delegitimized suggests that only the experiences of certain people – typically those with privilege – matter.

Next time baseball or another sport is used as a trope for national belonging or pride, it is essential to question whose “field of dreams” we are really discussing.

Abigale Vercauteren is a gender studies doctoral student in the School of Social Transformation, within ASU's College of Liberal Arts and Sciences. Her research interests include feminist movements in the Middle East, transnationalism, and the intersection of homophobia and sexism in U.S. sports culture.

Britt Lewis

Interim Communications Director, ASU Library