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. The intensity of the light is proportional to the amount of energy, which in turn corresponds to the length of accumulation time. Thus the time can be approximated for original original firing date. Recently new techniques optically stimulated luminescence dating using lasers and sensitive detectors have been used to improve the light detection. Samples require about milligram and the sample collection and handling step is critical. The rate of energy accumulation depends on the amount of background radiation to which the object has been exposed.
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Specimen Label. Unusual within the genus for its distribution – it is the only species found in the eastern United States – and its polymorphic workers. The minor worker of badius , which is the dominant subcaste, can readily be distinguished from the worker of all other species of North American Pogonomyrmex by the head shape, which is rather strongly narrowed posteriorly in full-face view, the conformation of the scape base, and the small eyes which are placed distinctly beneath the middle of the sides of the head.
The major workers, as well as the intermediates, are defined nicely by their disproportionately enlarged heads. Moreover, there is an accentuation of feminine traits in the thorax of the intermediates and especially of the majors, the sclerites being well delimited and bearing a striking resemblance to those of the female caste. The species which is most likely to be confused with badius in the worker caste is Pogonomyrmex comanche.
The configuration of the petiole and post petiole is quite similar in the two, and both species have the nodes rather coarsely and generally transversely rugose. But whereas the dorsum of the petiolar node of comanche , seen in lateral view, is flattened and usually bears a distinct median depression, that of badius is convex and not depressed. Both species have a strongly arched thorax; but comanche possesses perfectly normal epinotal spines whereas badius has an unarmed epinotum under normal conditions, though it may occasionally have aberrant epinotal spination vide infra.
In comanche only the basal face of the epinotum is rugose, the declivous face being free of sculpture; in badius both faces of the epinotum are rugose. The female of badius should be clearly recognizable. The head is very wide in proportion to its length CI l and bears a sharply emarginate midoccipital border; the eyes are small, weakly protuberant, and set low on the sides of the head; the cephalic rugae diverge strongly into the occipital corners; the ultimate basal mandibular tooth is offset in two planes posteriorly and dorsally, with the mandible in closed resting position ; the epinotum is normally unarmed and its basal face is broadly concave.
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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. It uses various methods to stimulate and measure luminescence. All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium , uranium , thorium , and rubidium.
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Geochronology/Optically stimulated luminescence
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Past and present human/environment interactions, optically stimulated luminescence (OSL) dating, human evolution and dispersal in Africa, Asia and Australia.
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