1984), occurred during the Hypsithermal
period between ~8000 yBP and 3500 yBP (Davis et al.
Even accounting for the Holocene hypsithermal
, the climate would have been marginal for agricultural purposes and expected to generate periods of crop failure and famine (Birnie et al.
As reviewed in Tuma (2006), disjunct populations are believed to be remnants of populations that dispersed northeastward during the hypsithermal
Her topics include thinking about archaic hunter-gatherers, the location of shell-bearing sites, the over exploitation of mollusks, the demise of the Hypsithermal
, whether there were villages, archaic rituals at shell-bearing sites, and the theoretical landscape from archaic villages to ritual camps.
Characteristic sand savanna and sand prairie vegetation became established during the Hypsithermal
period about 8,000 years ago (King 1981).
During the preceding Medieval Warm Period, which peaked at about 1000 AD, Alpine ice cover in the northern hemisphere was substantially less than at present, and over much of the Canadian Cordillera there may have been no glaciers at all during the Holocene Maximum or Hypsithermal
Several lacustrine cores from Silver and Stony Lakes, Oceana County, MI were obtained by vibracoring for the purpose of determining if there was climate variability recorded during the Little Ice Age, the hypsithermal
episode, the 8.
One scenario is that the water table dropped at the beginning of the Hypsithermal
between 9000-8000 ybp and that subsequent erosion resulted in the loss of the most recently deposited sediments.
The distribution of this species may have been extended northward to New England during the Hypsithermal
Interval by dispersal of spores.
These several relictual populations collectively suggest a wider distribution of the species to the north in the past, during a hypsithermal
period, and a partial withdrawal during the current hypothermal period, occurring not long enough ago to have permitted subsequent taxonomic differentiation.
Characteristic savanna and prairie vegetation became established during the Hypsithermal
in an interval called the Hypsithermal
(a warm, dry period), (3) a cooling trend that began about 5,000 yr.