Archaeological records show us that humans apparently came to live here during the
Altithermal period, from 5,500 to 3,000 B.
Fossil bison and artifacts from an early
altithermal period arroyo trap in Wyoming.
This may refer to the severe
Altithermal drought of 7500-8000 B.
The site is near Lake Huron and likely experienced a lowered ground water table until about 6,000 years ago at the end of the dry Altithermal period, when lake and ground water levels were lower throughout the Midwest.
Desiccation and fracturing were probably heightened in the Till Plains of Ohio during the dry Altithermal period (about 6,000 to 9,000 years ago) when prairies and grasslands of the Plains expanded eastward to central Ohio.
Altithermal timberline advance in western United States.
Altithermal archeology and paleoecology at Mustang Springs, on the Southern High Plains of Texas.
During the middle Holocene of 7000-5000 years ago, referred to as the
Altithermal, temperatures were considerably warmer than today, paralleling climate now seen in the southeastern Atlantic States.
Apparently there was no warm-moist or dry
Altithermal interval in central Texas but rather a pronounced period of drier and possibly warmer conditions starting about 2000 years ago (Holloway et al.
1988) proposed that this climatic event was the
Altithermal as originally defined by Antevs (1955).
