Sediment Mapping of Archaeologically Significant Lakes on the Coteau des Prairies in Southwestern Minnesota
This project used grant funding to complete a sonar survey of Lake Benton and Lake Hendricks in southwestern Minnesota. The survey mapped the depth and composition of sediments beneath the lake floors to identify locations for collecting sediment cores. The work took place in spring and summer 2024 and helped clarify where the oldest and thickest sediment deposits are located.
The survey showed that a previous core from Lake Benton had sampled only the edge of the deepest sediment area. Using the new survey data, researchers collected new sediment cores as part of a related project. These cores matched well with the subsurface features seen in the seismic survey, confirming the value of the mapping.
This project supports the research on the more than 10,000-year record of human presence in southwestern Minnesota. The shifting climate and environmental changes since the end of the last Ice Age played a critical role cultural changes and adaptations for people living in the region. By identifying where complete sediment sequences are preserved, the project makes it possible to link environmental changes to the long history of human activity in the area. The survey data and methods will help future research on climate, environment, and archaeology in the region.
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$6,451,000 the first year and $7,035,000 the second year are for statewide historic and cultural grants to local, county, regional, or other historical or cultural organizations or for activities to preserve significant historic and cultural resources. Money must be distributed through a competitive grant process. The Minnesota Historical Society must administer the money using established grant mechanisms with assistance from the advisory committee created under Laws 2009, chapter 172, article 4, section 2, subdivision 4, paragraph (b), item (ii).
Available upon request. Contact: grants@mnhs.org
Available upon request, grants@mnhs.org