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El Riego phase : ウィキペディア英語版 | El Riego phase The El Riego phase is a Mexican archaeological period in the Tehuacan Valley Sequence that came to pass during the early part of the Archaic period in the Americas. The El Riego phase is the second period in the sequence; preceding it was the Ajuereado phase, and the Coxcatlan phase came later. Dating for the El Riego phase differs slightly from source to source, it has been said to have occurred from as wide a span as 8650 - 5700 BC〔Evans, Susan Toby (2008). "Ancient Mexico & Central America: Archaeology and Culture History", p. 86. Thames & Hudson Ltd., United States of America. ISBN 0-500-28714-7〕 to as narrow as 6800 - 5000 BC.〔Nance, Roger C. (1992). "The Archaeology of La Calsada: A Rockshelter in the Sierra Madre Oriental, Mexico", p. 118-121. University of Texas Press, Austin, Texas. Retrieved Oct. 15, 2011.〕 ==Tehuacan Valley Sequence== The Tehuacan Valley Sequence was a project directed by Richard MacNeish which involved an archaeological survey of the Tehuacan Valley and excavations at various archaeological sites in the region - six excavated sites and seven surface sites.〔 The findings of the project allowed the entirety of the occupation of the Tehuacan Valley to be understood. This sequence provided the first broad perspective of the transition from a foraging society to a village farming society in Mesoamerica.〔 Dates established for the El Riego phase are based on sixteen radiocarbon assays.〔
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