A micromorphological analysis of stratigraphic integrity and site formation at Cactus Hill, an early Paleoindian and hypothesized pre-Clovis occupation in South-Central Virginia, USA

摘要

Twenty thin sections were studied front Cactus Hill, a ca. 20 ka stratified sand dune site in Virginia, USA, with a Clovis and hypothesized pre-Clovis component. The high-resolution soil micromorphology investigation focused on testing the integrity of Clovis and pre-Clovis stratigraphy from one location where there is a high density of artifacts. Site formation processes were dominated by eolian (dune) sand formation. There was also ephemeral topsoil development and associated occupation, along with their penecontemporaneous disturbance and dispersal by scavenging annuals (assumed) and localized down-working by small invertebrate mesofauna (as evidenced by aggregates of fine phytolith-rich humic soil and fine soil-coated charcoal fragments). Partial erosion of these occupation soils (deflation?) was followed by successive sand burial. Post-depositional processes affecting these sand-buried Occupations involved only small-scale bioturbation and overprinting of clay lamellae, suggesting site stratigraphy has been stable for a long time. Soil micromorphological analysis has defined a difference between occupational units (pre-Clovis and Clovis) and sterile units found between these units as well as above and below In summary, according to this analysis, the site appears intact with only minor disturbances affecting the long-term integrity of the stratigraphy. (C) 2008 Wiley Periodicals, Inc.