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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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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