There was the arrival of new people, especially with South Africa new technology and equipment of stone of change, there were a few hundred thousand years ago in Eurasia and in the local population gradually and independently in different places and at times is a better industry wising.

So Daniel Adler, Associate Professor of anthropology at the University of Connecticut, and colleagues-researchers stone artifacts preserved lava flow and thousands of Geghi 1, that features an Armenian southern Caucasus archaeological site nor investigated, which recovered from a recently completed study shows based on the artifact bearing between 200,000 and 400,000 years ago dated melancholy. Date artifacts, 325000-335000 years old, such hand lower stone during early human populations were common among axes, And Levallois, a stone tool production method as two different stone tools were a mix of bifacial tools, technological traditions-usually in Middle Stone age in Africa and Eurasia Middle Stone age attributed to. Researchers in two technologies 1 nor Geghi coexistence Levallois technique outside of the existing local population biface technology is developed that provides the first clear evidence debate.

"The combination of these various technologies in a place about 150 years ago, there were people on the site innovative 325000, that shows us," Adler says.

Published in the September 26 issue of science, documenting research paper 2014, biface and Levallois technology, specific, while a common part of the evolutionary line that presents the argument. In a stone Biface technology is such a hand AX as a tool to produce two opposite surfaces of stone flakes is shaped through the removal. Separate flakes are discarded as waste products.

Levallois technology, stone is a central core of the convex surface tool, or to produce flakes is shaped through the removal. Flakes produced in predetermined shapes and sizes and are used as tools. Archaeologists in terms of raw materials Levallois technology is suggested. Flakes of highly mobile hunters gatherers for a relatively small and easy to carry are useful. It improves a biface technology advancement and innovation is interpreted as.

Africa, the Middle East and Europe on the basis of comparison of data from archaeological sites, the study authors of this change was gradual and freeze-freeze, and this is a common shared ancestry within the various technical human populations suggest that independently. In other words Levallois technology at different times in different places already developed out of biface technology.

His conclusion technological changes during this period the population changes (a new beginning or a large population by population replacement) challenged the view from. "I take all the artifacts from this site and an archaeologist to show them, they immediately categorized in different groups according to the chronology starts to happen," Adler says. However, he found the artifacts in nor Geghi 1 actually to antiquity of the human capacity for innovation speaking, also reflect the technical flexibility and variability of a population that shows.