In:
Geoarchaeology, Wiley, Vol. 20, No. 6 ( 2005-08), p. 599-625
Abstract:
Middle Park, a high‐altitude basin in the Southern Rocky Mountains of north‐central Colorado, contains at least 59 known Paleoindian localities. At Barger Gulch Locality B, an extensive Folsom assemblage (˜10,500 14 C yr B.P.) occurs within a buried soil. Radiocarbon ages of charcoal and soil organic matter, as well as stratigraphic positions of artifacts, indicate the soil is a composite of a truncated, latest‐Pleistocene soil and a younger mollic epipedon formed between ˜6000 and 5200 14 C yr B.P. and partially welded onto the older soil following erosion and truncation. Radiocarbon ages from an alluvial terrace adjacent to the excavation area indicate that erosion followed by aggradation occurred between ˜10,200 and 9700 14 C yr B.P., and that the erosion is likely related to truncation of the latest‐Pleistocene soil. Erosion along the main axis of Barger Gulch occurring between ˜10,000 and 9700 14 C yr B.P. was followed by rapid aggradation between ˜9700 and 9550 14 C yr B.P., which, along with the erosion at Locality B, coincides with the abrupt onset of monsoonal precipitation following cooling in the region ˜11,000–10,000 14 C yr B.P. during the Younger Dryas oscillation. Buried soils dated between ˜9500 and 8000 14 C yr B.P. indicate relative landscape stability and soil formation throughout Middle Park. Morphological characteristics displayed by early Holocene soils suggest pedogenesis under parkland vegetation in areas currently characterized by sagebrush steppe. The expansion of forest cover into lower elevations during the early Holocene may have resulted in lower productivity in regards to mammalian fauna, and may partly explain the abundance of early Paleoindian sites (˜11,000–10,000 14 C yr B.P., 76%) relative to late Paleoindian sites (˜10,000–8000 14 C yr B.P., 24%) documented in Middle Park. © 2005 Wiley Periodicals, Inc.
Type of Medium:
Online Resource
ISSN:
0883-6353
,
1520-6548
Language:
English
Publisher:
Wiley
Publication Date:
2005
detail.hit.zdb_id:
1479950-9
SSG:
6,14
SSG:
13
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