Along the Mighty Quinn: Palaeoclimates and Human Occupation in the Quinn
River Drainage
Abstract
The Upper and Lower Quinn River subbasins (HUC-8 16040201,16040202)
comprise one of the largest single drainages in northwest Nevada. The
sub-basins cover approximately 1.7 million hectares. The Quinn river
originates in the Montana Mountains and Santa Rosa Range and drains to
the Black Rock Desert Playa. The elevational gradient ranges from 2000 m
to 1100 m. Sagebrush and perennial grasses dominate the higher
elevations, with the lowlands being dominated by greasewood, saltbrush,
and desert scrub. This presentation examines the human habitation in the
sub-basins over the past 13,000 years in context to the palaeoclimatic
records from the sub-basins and adjoining areas. Over 1100 prehistoric
sites exist in the study area, with 19 sites having been excavated and
yielding 108 radiocarbon dates. Palaeoclimate proxies from the study
area include the Mud Meadows and Summit Lake pollen cores, and the
Jackson Mountain tree ring widths. While the radiocarbon record shows
numerous gaps between 13 kBP and 5 kBP, the summed probability
distribution of calibrated radiocarbon dates suggests continuous
occupation from 5 kBP to 1 kBP with exponential growth. Based on the
abundance of Chenopodiaceae pollen in the Summit Lake core, the study
area is drier than today during the Late Holocene Drought (LHD, ca. 2.5
to 1.9kBP). During the LHD, sites south of 41N are abandoned or see no
growth; northwards, sees site growth. Despite contrasting climatic
conditions, the Late Antique Little Ice Age (LALIA) and the Medieval
Climatic Anomaly (MCA) are both periods of site occupation and growth
across the sub-basins. Occupied sites are found throughout the
sub-basins during the LALIA, and during the MCA site occupation is
focused at Trego hot springs and at higher elevations. As evidenced by
the three palaeoclimate proxies from the sub-basins, the Little Ice Age
is a period of cooler temperatures and increased moisture. Despite the
ameliorated conditions, the number of dated sites significantly
decreases. This may reflect a more dispersed settlement pattern with
lower numbers of residents during the Terminal Prehistoric period.