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The unassuming remains of a stone wall that once partly closed off the entrance to the prehistoric Theopetra Cave near Kalambaka, Thessaly, have recently been dated by specialists to about 21000 BC, making it the oldest known man-made construction in Greece and likely the world, according to a statement on March 22, 2010, by the Greek Ministry of Culture and Tourism.According to radio carbon dating, the date 23,000 BP (years before present) was determined by a pair of scientists, Nicholaos Zacharias and Ioannis Basiakos, at the Archaeometry Laboratory of the National Center for Scientific Research Demokritos, using a relatively new method of dating called Optically Stimulated Luminescence (OSL, see below).Our sexcam partners include Chaturbate, Slux.tv, Glam Cams, and Sweetie Cams (more coming soon).All of this means you can sex chat with thousands of live amateur models – from all the best adult cam sites – through our super-simple, convenient interface.The older a sample is, the more luminescence it emits.To determine age, a comparison is made between sediments with a known amount of added radiation and sample sediments that were affected naturally.OSL involves beaming sediment samples with blue, green or infrared light to determine how long ago minerals including quartz and feldspar were last exposed to daylight.
s suggested date coincides with the last glacial period (circa 110,000-10,000 years ago) and indicates that the structure may have been built by Paleolithic inhabitants of the cave to protect themselves against the bitter cold.
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Mineral-rich sediments such as those deposited over thousands of years in the Theopetra Cave can be an important source of information for specialists trying to pinpoint when a prehistoric archaeological site was inhabited.
Optically stimulated luminescence (OSL), invented in 1984 at Simon Fraser University in Canada, is considered a valuable Quaternary dating method for a variety of aeolian, fluvial, marine and colluvial sediments.
Analysis of carbonized plants and seeds has also begun to shed light on the inhabitants?