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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 to as narrow as 6800 - 5000 BC.
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