| http://www.w3.org/ns/prov#value | - Thereafter, however, there was a gradual drying of the climate; and their data from Lake Zempoala indicate that ???the interval from 1300 to 1100 cal yr BP was driest and represents an extreme since the mid-Holocene,??? noting further that this interval of 200 years ???coincides with the collapse of the Maya civilization.??? Likewise, they report that their data from Lake Quila are also ???indicat
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