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Stone rows, enclosures, structures and chambers can be found in the landscapes of Massachusetts and Rhode Island. Structures similar to those shown in the cover photo are documented elsewhere. The age, cultural affiliation, and purpose of these stone structures--which are found in a variety of forms, such as piles arranged in spatial configurations across landscapes, shapes suggesting animal effigies, platforms and chambers--have been the subject of much debate. Some have argued they are remnants of colonial agricultural and storage practices; others that they are prehistoric Native American ceremonial structures. Ascertaining the time periods of their creation had previously been impossible. We felt that optically...
Tephra samples were collected by Leah Morgan (now at the U.S. Geological Survey (USGS)) from the Hugub Area, Kesem-Kebena-Dulecha, Afar, Ethiopia. Sanidine grains were separated from the bulk sample and analyzed by argon geochronology at the Scottish Universities Environmental Research Centre, Scotland. The data indicate that the age of the Hugub Bed, which is rich in archarological artifacts, is ca. 500 ka. These results have broad implications in understanding late Acheulean archaeology in Ethiopia.
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Tags: 40Ar/39Ar,
Afar,
Argon Geochronology Laboratory,
Awash River,
East African Rift Valley,
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