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Credit: Luke Gliganic Stone tools have been made by humans and their ancestors for millions of years. For archaeologists, these rocky remnants—lithic artifacts and flakes—are of key importance. Because of their high preservation potential, they are among the most common findings in archaeological excavations.
Interracial dating is most common among, numerical dating of these lithic artifacts, especially when they occur as surface findings, remains moost major challenge. Usually, stone tools cannot be dated directly, but only when they are embedded in sediment layers together with, for example, organic material.
The age of such organic material can be constrained via the radiocarbon technique. If such datable organic remains are missing or if stone artifacts lack a stratified sedimentary context, but rather occur as scattered surface artifacts, numerical dating becomes very difficult or is simply impossible. A precise age determination of lithic artifacts that occur as surface finds has therefore hardly been possible so far. Many aspects of ancient amobg behavior have only been preserved as surface finds, hence cannot be dated precisely with currently available dating methods. By further developing the Optically Stimulated Luminescence OSL dating technique, we can now, for the first time, carry out precise, and direct age measurements on lithic artifacts.
In our current study we used stone artifacts from an archaeological surface site in south-central Tibet," explains Michael Meyer, head of the Luminescence Laboratory at the Department of Geology at the University of Innsbruck interracial dating is most common among one of the main authors of the study now published in the renowned journal Science Advances. OSL dating is based on the measurement of light stored in natural minerals and is one of the most important absolute dating tools in archaeology and the earth sciences. These minerals can be imagined as miniaturized clocks. Each grain is a tiny clock that can be 'read-out' under controlled laboratory conditions. The light signal allows us to infer the age of the archaeological sediment layer or artifact. The more light, the older the sample," says the geologist. Credit: Michael Meyer Quarrying activities more than 5, years ago Due to its extreme environmental and climatic conditions the dry highlands of Tibet are considered to be one of the last regions on earth that were occupied by humans.
When exactly peopling of interracial dating is most common among remote and rather extreme environments occurred has caused a lot of scientific debate over the course of the last decade. InMichael Meyer dated the famous human foot and hand prints of Chusang in the central part of the Tibetan plateau to an age between 8, and 12, years. In the current study, Meyer and his team analyzed archaeological finds from southern Tibet in the Innsbruck OSL Laboratory: The excavation site Su-re is located immediately north of the Mount Everest-Cho Oyu massif in the so-called Tingri graben at an elevation of meters.
Surface artifacts are particularly common in Tibet. To date them, the researcher used the so-called rock surface burial dating technique and applied it to lithic surface artifacts. This method determines the point in time when the stone artifact was discarded by humans and at least partly covered by earth. The inside of a rock has never been exposed to sunlight, so we have a saturated luminescence signal there and an infinite high age. However, if the rock surface is exposed to daylight for a long enough time, the signal in the top millimeters or centimeters of the rock will be erased. This happens during knapping, when the stone tool is interracial dating is most common among, and also during the subsequent artifact use by humans. When the artifact is then discarded and at least partially buried in sediment and shielded from light, the luminescence signal in this artifact surface recharges.
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By intedracial this depth-dependent luminescence signal in the rock surfaces, we can calculate the age of the artifact discard, taking into account the dynamics of local earth surface processes. Such an approach allows us to date stone artifacts directly, even if they occur as surface finds," Meyer explains. The analyses on the surface artifacts from southern Tibet revealed an age between 5, and 5, years. For Michael Meyer, the analysis of these Tibetan artifacts is just the beginning: "This OSL-based method opens up new vistas in archaeological dating and holds great potential also for sites on other continents that preserve lithic artifacts in a favorable setting," concludes the geologist.
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Explore further More information: L. Gliganic el al. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.]