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Artifacts of the Clovis people are found throughout most of the United States and as far south as Panama in Central America.Since the early 21st century, this standard theory has been challenged based on the discovery and dating of pre-Clovis sites such as Monte Verde in Southern Chile, Cactus Hill in Virginia, and Buttermilk Creek in Texas. | Calculating Age | Challenges for OSL | Case studies of OSL dating in glacial environments | References | Comments | Another way of dating glacial landforms is optically stimulated luminescence dating (OSL).
This page was contributed by Dr Georgina King from the Aberystwyth Luminescence Research Laboratory in the Institute for Geography and Earth Sciences. OSL is used on glacial landforms that contain sand, such as sandur or sediments in glacial streams. Once the sand grain has been buried and it is no longer exposed to sunlight, the OSL signal starts to accumulate. Testing an approach to OSL dating of Late Devensian glaciofluvial sediments of the British Isles. OSL works because all sediments have some natural radioactivity, caused by the presence of uranium, thorium and potassium isotopes in heavy minerals such as zircons. Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating.It is useful to geologists and archaeologists who want to know when such an event occurred.