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From extensive backhoe trenching and coring in the Great Miami–Ohio River confluence region, in conjunction with a large suite of radiocarbon ages, we have identified large tracts of late Holocene alluvium. Thick blankets of Historic alluvium (post‐settlement) may also cover levees of the Ohio River. In conjunction with other studies in the Outer Bluegrass Region of the lower Ohio River valley, it is possible to document an association between floodplain Mollisols, Inceptisols, and Entisols and late Holocene‐aged landforms. Levees appear to have stabilized between 1000 and 2000 yr B.P. Although buried soils are rare, archaeological materials were ubiquitous in late Holocene Landform Sediment Assemblages. Because a substantial volume of valley fill is late Holocene in age, Woodland sites of all types are frequently buried, and Fort Ancient sites may be buried by Historic alluvium. Therefore, if Woodland or later settlement studies in this region are based on surface evidence alone, they are likely to be biased. © 2002 John Wiley & Sons, Inc.

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Structural changes in Archaic landscape use are examined using a large-scale survey data set from the dissected forested uplands of southwest Indiana. Spatial patterning of hafted bifaces, as indicated by proximity to streams of different order and distance from major rivers, was found to vary between the Early and Middle Archaic periods. Early Archaic settlement emphasized the upper reaches and divides of basins, but also included near-river locations, while Middle and later Archaic groups focused on locations near basin outlets and major rivers. These changes are argued to be a function of reduced residential mobility and a shift from a largely foraging to a collecting strategy. Increased travel and processing costs associated with a logistical strategy resulted in a deemphasis of more distant extravalley resource patches. Several explanations for this shift in strategies are explored, including possible increased spatiotemporal heterogeneity of the environment associated with postglacial climate and vegetation change.