Using palynological data, Haynes and Mehringer concluded that the climate at the Lehner Clovis site in southeastern Arizona 11,000 years ago was:

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Palynological data, which involves the study of pollen grains and other spores, often provides insights into past climates. In the case of the Lehner Clovis site, the data suggested a climate that was only slightly wetter and cooler than today, which then experienced a rapid shift toward drier conditions. This conclusion is based on the types and quantities of pollen found, which indicate the types of plants that were growing at the time and, by extension, the climate conditions those plants would have required.

Using Palynological Data, Haynes and Mehringer Concluded That the Climate