A linear mound concentration in the Central Des Moines River valley.

This report summarizes the discovery of ca. 200 linear mounds along 40 km of the Des Moines River in central Iowa. Many of these mounds were mapped and recorded piecemeal over a century, but their full extents were not known until recent high-resolution lidar mapping. General insights about the age and significance of the mounds can be inferred from nearby archaeological sites and surface finds, as well as comparisons with regional mounds. Limited archaeological evidence suggests the linear mound concentration may be associated with a long stable Woodland occupation of the region, culminating in the Late Woodland Great Oasis manifestation. [ABSTRACT FROM AUTHOR]