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34 <br /> Table 1 <br /> Prehistoric Chronology Applicable to the Dowe Flats Study Area <br /> Years Before Cultural Period Environmental <br /> Present Conditions <br /> 12, 000 - 7, 500 Paleo-Indian Generally <br /> cooler, savannah <br /> 71500 - 5, 000 Early Archaic Continental <br /> warming trend <br /> 5, 000 - 3, 000 Middle Archaic Cooler than <br /> previous episode <br /> 3, 000 - 2, 000 Late Archaic Moister; Triple <br /> Lakes glaciation <br /> on Front Range. <br /> 2, 000 - 1, 000 Early Ceramic Expansion of <br /> sage-grassland <br /> vegetation zone. <br /> 1, 000 - 275 Middle Ceramic Audubon Cirque <br /> glaciations on <br /> Front Range <br /> 275-150 Protohistoric/ Predominately <br /> Contact modern <br /> conditions. <br />