There are no GIS files associated with this compilation. It was made for printing and visualization. GIS files are available with the detailed digital database D-1 at the MGS Data Portal -- https://mngs-umn.opendata.arcgis.com/ and are not available in this archive. S-23 compiles new and previously published geologic mapping to show the surficial sediments in Minnesota as a printable !:500,000 scale version. In contrast to Hobbs and Goebel (1982), where map colors indicated provenance, on this map unit colors refer to texture: green for diamicton interpreted to be till, red/orange for sand and gravel-dominated sediments, and blue for silt and clay. Glacial sediments were mapped using lithostratigraphic formation names of Johnson and others (2016) and references therein. Post glacial and proglacial sediments were named for their genesis. Peat is shown in Figure 1. Modern lake sediment is not shown here. Refer to Figure 2 for the location of major provenances and the names and extent of ice lobes during the late Wisconsinan glaciation. Unless otherwise noted, the two-letter map-unit abbreviation indicates diamicton interpreted to be till of a particular formation. The addition of a third letter indicates associated sediments.
Scale 1:500,000. Compiled and edge-matched mapping from 1:100,000 scale MGS Quaternary maps, then simplified for printing. The complete database (d-1) contains lines, labels and polygons that will be updated as new MGS mapping becomes available. This database is available to the general public as an ESRI Story Map (https://mngs-umn.opendata.arcgis.com/) and can be downloaded or new maps produced online, but is not editable.
U. S. Geological Survey, National Cooperative Geologic Mapping Program, Great Lakes Geologic Mapping Coalition
Lusardi, Barbara A; Gowan, Angela S; McDonald, Jennifer M; Marshall, Katherine J; Meyer, Gary N; Wagner, Kaleb G.
S-23 Geologic Map of Minnesota - Quaternary Geology.
Minnesota Geological Survey.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital Conservancy may be subject to additional license and use restrictions applied by the depositor.