| Abstract: | Field investigations in southern Egypt have yielded Acheulian artifacts in situ in authigenic carbonate deposits (CaCO3-cemented alluvium) along the edges of nowaggraded paleovalleys (Wadi Arid and Wadi Safsaf). Uranium-series dating of 25 carbonate samples from various localities as far apart as 70 kilometers indicates that widespread carbonate deposition occurred about 45, 141 and 212 ka (thousand years ago). Most of the carbonate appears to have been precipitated from groundwater, which suggests that these three episodes of deposition may be related to late Pleistocene humid climates that facilitated human settlement in this now hyperarid region. Carbonate cements from sediments containing Acheulian artifacts provide a minimum age of 212 ka for early occupation of the paleovalleys. |
| Genre: | Article |
| ProdID: | 70015098 |
| Citation Author: | Szabo, B. J.; McHugh, W. P.; Schaber, G. G.; Haynes, Jr. , C. V.; Breed, C. S. |
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| Citation End Page: | 1056 |
| Citation Issue: | 4894 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Uranium-series dated authigenic carbonates and acheulian sites in southern Egypt; 1989; Article; Journal; Science; Szabo, B. J.; McHugh, W. P.; Schaber, G. G.; Haynes, Jr. , C. V.; Breed, C. S. |
| Citation Start Page: | 1053 |
| Citation Volume: | 243 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Uranium-series dated authigenic carbonates and acheulian sites in southern Egypt; 1989; Article; Journal; Science; Szabo, B. J.; McHugh, W. P.; Schaber, G. G.; Haynes, Jr. , C. V.; Breed, C. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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