A dating method that measures the amount of light released when an object is heated. Thermoluminescence, or TL, has been used since the s to determine the approximated firing date of pottery and burnt silicate materials. TL has a wide dating range; it has been used to date ceramics from a few hundred years old to geologic formations that are half a million years old. The technique measures the small amount of energy that continually builds up in the mineral crystal lattice. When heated, this energy is released as a burst of light.
Optically stimulated luminescence thermochronometry
Optically stimulated luminescence - Wikipedia
In physics , optically stimulated luminescence OSL is a method for measuring doses from ionizing radiation. The method makes use of electrons trapped between the valence and conduction bands in the crystalline structure of certain types of matter such as quartz , feldspar , and aluminum oxide. The trapping sites are imperfections of the lattice - impurities or defects. The ionizing radiation produces electron-hole pairs - electrons are in the conduction band and holes in the valence band. The electrons which have been excited to the conduction band may become entrapped in the electron or hole traps. Under stimulation of light the electrons may free themselves from the trap and get into the conduction band. From the conduction band they may recombine with holes trapped in hole traps.
Tracking Glaciers Along The Edges Of The Driftless Area
Buttermilk Creek Complex refers to the remains of a paleolithic settlement along the shores of Buttermilk Creek in present-day Salado, Texas dated to approximately 15, years old. If confirmed, the site represents evidence of human settlement in the Americas that pre-dates the Clovis culture. Friedkin Paleo-Indian archaeological site in Bell County, Texas has provided archaeological evidence of a human presence in the Americas that pre-dates the Clovis peoples, who until recently were thought to be the first humans to explore and settle North America. The site's pre-Clovis occupation is supported by numerous lines of evidence including optically stimulated luminescence OSL dates ranging from 13,, before present, undisturbed stratigraphy , and an extensive stone tool assemblage. Michael R.
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