{ "culture": "en-US", "name": "", "guid": "", "catalogPath": "", "snippet": "", "description": "The map depicts bedrock geologic units exposed and covered by glacial sediment in Renville County. The interpretation relies on previously published and unpublished geologic mapping, augmented with high-resolution geophysical data and field work by the authors. The bedrock ranges in age from Paleoarchean (3600-3200 Ma, or million years old) to Late Cretaceous (~90 Ma), and records a complex history involving multiple igneous, sedimentary, metamorphic, and tectonic events, as well as significant episodes of weathering and erosion.", "summary": "", "title": "Bedrock Geology", "tags": [], "type": "", "typeKeywords": [], "thumbnail": "", "url": "", "minScale": "NaN", "maxScale": "NaN", "spatialReference": "", "accessInformation": "Mark A. Jirsa, Dale R. Setterholm, and V.W. Chandler", "licenseInfo": "", "portalUrl": "" }