Geology and manganese potential of the Cretaceous rocks of southwestern Minnesota

Geologic map of Cretaceous age rocks in southwestern Minnesota and geochemical results from a materials sampling program, scale 1:250,000, Maps missing.Setterholm, D.R.. (1989). Geology and manganese potential of the Cretaceous rocks of southwestern Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/121815

M-069 Geologic maps of the Late Cretaceous rocks, southwestern Minnesota

Scale 1:750,000, 2 pls. PLATES: 1, Map A.--Bedrock geology; 2, Map B.--Bedrock topography of the sub-Cretaceous surface and Map C--Bedrock topography of the sub-Quaternary surface and Map D.--Isopachs of residual Cretaceous strata and Map E.--Isopachs of Quaternary strata.Setterholm, D.R.. (1990). M-069 Geologic maps of the Late Cretaceous rocks, southwestern Minnesota. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/60007

M-070 Distribution of arsenic in ground water and rocks, southwestern Minnesota

Scale 1 inch = 7.5 miles

Stratigraphy and geochemistry of the Cretaceous rocks of southwestern Minnesota

Preliminary descriptions of the stratigraphy and geochemistry of Cretaceous age rocks, Southwestern Minnesota. report and 6 plates at scale of 1:250,000, Plate 1-Sub-Cretaceous bedrock topography; Plate 2-SubQuaternary bedrock topography; Plate 3- Cretaceous residual thickness isopach; Plate 4-Quaternary thickness isopach; Plate 5-Database; Plate 6- Cross Sections, scale 1:250,000. Superseded by Minnesota Geological Survey publications M-69 and IC-27

Preliminary bedrock geologic map of the Calumet quadrangle, St. Louis County, Minnesota

Preliminary bedrock geologic map, scale 1:24,00

Information Circular 27. Minnesota Kaolin Clay Deposits: A Subsurface Study in Selected Areas of Southwestern and East-Central Minnesota

Large deposits of kaolin-the residual products of the weathering of igneous and metamorphic rocks-are common in southwestern and east-central Minnesota. Thin and discontinuous beds of sedimentary kaolin (resulting from the reworking of the residuum) are less common and volumetrically less significant. The weathering occurred prior to deposition of Late Cretaceous sedimentary strata. Because climatic conditions were uniform within the study area, the differences in the thickness and composition of the residuum are attributable to the mineralogic and hydrologic properties of the parent rock (protolith). Goldich (1938) and others have shown that weathering and the products of weathering are strongly controlled by the mineralogic composition of the protolith. Rocks rich in mafic minerals and plagioclase are generally more extensively weathered, and their residuum is richer in kaolinite. This susceptibility to weathering is evident in the mineralogic composition of the residuum and is reflected in the concentration of kaolin near the top, and in the addition of other minerals with increasing depth. The weathering process is also dependent on the movement of water and other fluids; therefore, permeability is a second important control on the production of kaolin. In igneous and metamorphic rocks, fractures in the form of joints or faults are the primary paths of fluid movement. Weathering follows these paths, and the resulting kaolin deposits mimic the shape and orientation of the structural features. Preservation is the final factor controlling the distribution of kaolin clays. The upper part of the residuum contains the largest amount of clay, but it also is the most vulnerable to erosion. Glacial erosion has had a profound effect on the distribution and thickness of kaolin clay deposits in the state. The thickest deposits are found where Late Cretaceous sediments overlie the kaolin and indicate total preservation of the weathered products.This work was supported by the Legislative Commission on Minnesota Resources from funds allocated from the Mineral Resources Research Center, University of Minnesota, as part of the Industrial Minerals: Clay Project, 1987-1989

OFR91-05, Geologic factors affecting the sensitivity of the Prairie du Chien-Jordan aquifer

Geologic factors affecting the pollution sensitivity of the Prairie du Chien-Jordan aquifer including overlying glacial drift, scale 1:853,000. Plate 1 is unavailable.Setterholm, D.R.; Runkel, A.C.; Cleland, J.M.; Tipping, R.G.; Mossler, J.H.; Kanivetsky, R.; Hobbs, H.C.. (1991). OFR91-05, Geologic factors affecting the sensitivity of the Prairie du Chien-Jordan aquifer. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/122055

OFR10-02, Preliminary Bedrock Geologic Map of Minnesota

The contents of this report include preliminary geologic maps, bedrock topographic and depth to bedrock maps, and maps of ancillary data as pdf files. digital data files of the map elements, and those related to map compilation are also included. The maps were compiled at varied scales ranging from 1:500,000 to 1:24,000. They are printable at 1:500,000 scale; however, they are provided at 1:1,000,000 scale for this release. Note that the geologic maps are labeled "Preliminary".The geologic map and some associated digital map files that are part of this Open File Report have been superseded by the map and digital data that comprise S-21 in the State Map Series.Minnesota Minerals Coordinating Committee FY 2007-2008, and the State Special Appropriation to the Minnesota Geological Survey