Illinois Map Series

This statewide, full-color map includes much more detail about the state's bedrock geology than was previously available. Complex geologic features on the map, such as the bedrock geology near Hicks Dome in Hardin County, are shown in exploded view. The new information on the map was gleaned during the most recent 10 years of Survey mapping. Side 1 contains the map itself, the areas mapped since 1967, a legend, and explanation of symbols. Side 2 displays two large cross sections, one the width and the other the length of the state. A highly detailed stratigraphic column is shown. Several smaller maps portray other aspects of Illinois geology, including Sub Kaskaskia geology, Sub-Absaroka (Pennsylvanian Period geology, Quaternary geology, Sub-Tippecanoe geology, structural features, and the top of the Precambrian. Wirelog information and references are given also.
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This map shows the state's land surface in unprecedented detail, revealing regional structures and landforms that are too subtle to recognize on previous topographical maps. This amazing image of the state was created by using digital elevation data and by exaggerating the vertical scale twenty times. Lighting, shading, and color tinting techniques used in the map's production allow the reader to spot easily the landscape features such as floodplains, hills, river valleys, and glacial moraines. Scientists viewing the map for the first time quickly noticed landforms they hadn't seen before, including the unusual ridged topography along Interstate 39 in eastern Winnebago County.
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This map was produced in response to a need for current, detailed information about Illinois land, the raw material of the state. This land cover information for twenty-six identified categories is essential to ensure wise land-use decisions and good land stewardship. The satellite image data used to construct the map revealed that more than 76% of Illinois land is devoted to agriculture, primarily corn and soybeans, followed by forested lands (11.5%), urban and built-up lands (6.5%), wetlands (3.9%), and surface water (1.7%). A great companion to the Illinois Surface Topography map.
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With this road map in your car, you'll be able to check whether that hill in the distance is a moraine! Side relates the geology of Illinois to its highways and cities, so you can pinpoint your location and the geological features you see around you. Plus, these features are color-coded to explanatory text, making it easy to find out about specific locations. Side 2 contains maps of Illinois land cover, surface topography, quaternary geology, topography of the bedrock surface, and bedrock geology. Easy-to-understand explanations are included.
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Geologic Cross Sections Across the Mahomet Bedrock Valley, Champaign, Ford, McLean, Piatt, and Vermilion Counties was developed in the process of building a three-dimensional geologic model of the Mahomet aquifer. These detailed illustrations provide a window into the subsurface of this part of east-central Illinois that was not possible before. The cross sections depict the geologic materials encountered between the land surface and the bedrock along specific lines, or transects, across the Mahomet Bedrock Valley. The sequences shown of clayey sediment, interpreted as till and glacial lake sediment, and glacial sand and gravel capture the complex history of deposition and erosion of at least three main episodes of glaciation during the Quaternary Period. This map will be an important resource for people in the region who study or manage the underground water supplies, especially those involved in modeling groundwater flow, estimating water supplies, or evaluating water quality.
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Basal sand and gravel thickness of the middle Illinois River valley, Bureau, LaSalle, Marshall, Peoria, Putnam, and Woodford Counties, Illinois: Illinois State Geological Survey, Illinois Map 22, 1:62,500. Description: One 41" × 45" map sheet; contains map, legends; descriptive text, 1 table, and 3 figures. Author: Berg, R.C., E.D. McKay III, and B.J. Stiff, 2015.
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Soil parent materials of the middle Illinois River valley, Bureau, LaSalle, Marshall, Peoria, Putnam, and Woodford Counties, Illinois: Illinois State Geological Survey, Illinois Map 21, 1:62,500. Description: One 32" × 45" map sheet; contains map, legend; and descriptive text. Authors: Berg, R. C., E.D. McKayy III, and B. J. Stiff, 2015
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Aquifer sensitivity of the basal sand and gravel of the middle Illinois River valley, Bureau, LaSalle, Marshall, Peoria, Putnam, and Woodford Counties, Illinois: Illinois State Geological Survey, Illinois Map 20, 1:62,500.  One 40" × 45" map sheet; contains map, legend; descriptive text, and 2 figures. Authors: Berg, R.C., E.D. McKay III, and B.J. Stiff, 2015.
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Drift Thickness of the Middle Illinois River Valley, Bureau, LaSalle, Marshall, Peoria, Putnam, and Woodford Counties, Illinois: Illinois State Geological Survey, Illinois Map 18, 1:62,500.
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This map depicts the top elevation of the basal sand and gravel of the middle Illinois River Valley region from east of the “Big Bend” of the river near Hennepin to south of Chillicothe. This sand and gravel unit resides directly above the bedrock surface, is often thicker than 100 feet, and constitutes a major drinking water resource for the region. The map provides insight into the erosional and depositional history of the ancient Mississippi River, the ancient Illinois River, and the modern Illinois River. The topography of the sand and gravel deposit reflects numerous periods of sand and gravel deposition and erosion associated with glacial advances and retreats across the region and associated glacial-fluvial and modern fluvial events. The map is an essential precursor to an aquifer sensitivity map for the region, which will be based on the depth to and thickness of this basal deposit. The map is an outgrowth of mapping for a proposed Illinois Department of Transportation highway improvement project along Illinois Route 29 on the west side of the Illinois River north of Chillicothe.
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This surficial geology map, with information on the subsurface distribution of geologic materials, is valuable for the identification of opportunities and limitations for future land development and anticipation of the likely consequences of past and future land-use decisions. Typical applications of the map include estimation of groundwater resource potential, occurrences of potential aggregate resources, geologic conditions that may present hazards for construction, and the capability of the geologic setting to support certain land uses such as a landfill. The map is an outgrowth of mapping for a proposed Illinois Department of Transportation highway improvement project along Illinois Route 29 on the west side of the Illinois River north of Chillicothe.
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This bedrock topography map reveals the geomorphic features created by the ancient Mississippi River, the ancient Illinois River, the modern Illinois River, and numerous glacial advances and retreats. In the map area, the bedrock surface is buried beneath as much as 330 feet of glacial and post-glacial sediments. The overall relief (hills and valleys) of the bedrock surface affects the types of bedrock at its surface. This relationship is important for depicting the depth to bedrock for drilling operations and for predicting the distribution of shallow, economically significant rock resources. Most important, mapping of the bedrock topography delineates buried bedrock valleys, which often contain sand and gravel deposits that are aquifers. The map was an outgrowth of mapping for a proposed Illinois Department of Transportation highway improvement project along Illinois Route 29 on the west side of the Illinois River north of Chillicothe.
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