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Service Description: Major bedrock aquifers greater than 500 feet below ground surface. Groundwater quality with in deep major bedrock aquifers degrades from northwest to southeast in the northern portion of Illinois, due to the regional inclination of geological unit toward the center of the Illinois Basin in southeastern Illinois.
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Description: This map shows the distribution of major bedrock aquifer units at depths greater than 500 feet below ground surface in Illinois. Major aquifers are capable of yielding 70 gallons of water per minute. The data are sub-divided into (1) aquifers yielding potable water (containing less than 2,500 milligrams per liter of total dissolved solids), (2) aquifers yielding water containing from 2,500 to 10,000 milligrams per liter of total dissolved solids, and (3) aquifers yielding water containing greater than 10,000 milligrams per liter of total dissolved solids. The map indicates that groundwater quality within deep major bedrock aquifers degrades from northwest to southeast in the northern portion of Illinois. This degradation in water quality is due to the regional inclination of geological units toward the center of the Illinois Basin in southeastern Illinois. Stratigraphic units considered to be major bedrock aquifers are: Hunton Limestone Megagroup Ancell Group Prairie du Chien Group Ironton-Galesville Sandstone Elmhurst-Mt. Simon Sandstone. The scale of these data is 1:500,000.
Copyright Text: Illinois State Geological Survey
Spatial Reference:
102100
(3857)
Single Fused Map Cache: false
Initial Extent:
XMin: -1.0526339611217925E7
YMin: 4683679.259064018
XMax: -9400821.310401527
YMax: 5292418.730819956
Spatial Reference: 102100
(3857)
Full Extent:
XMin: -1.0187238261567574E7
YMin: 4434922.085764736
XMax: -9739922.660051879
YMax: 5238290.749529131
Spatial Reference: 102100
(3857)
Units: esriMeters
Supported Image Format Types: PNG32,PNG24,PNG,JPG,DIB,TIFF,EMF,PS,PDF,GIF,SVG,SVGZ,BMP
Document Info:
Title: Major Bedrock Aquifers at Depths Greater Than 500 Feet Below Ground Surface
Author: Illinois State Geological Survey
Comments: Major bedrock aquifers greater than 500 feet below ground surface. Groundwater quality with in deep major bedrock aquifers degrades from northwest to southeast in the northern portion of Illinois, due to the regional inclination of geological unit toward the center of the Illinois Basin in southeastern Illinois.
Subject: Major Bedrock Aquifers at Depths Greater Than 500 Feet Below Ground Surface
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Keywords: aquifer,groundwater,water,hydrology,hydrogeology,bedrock,Illinois
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TextAntialiasingMode: Force
Supports Dynamic Layers: true
MaxRecordCount: 1000
MaxImageHeight: 4096
MaxImageWidth: 4096
Supported Query Formats: JSON, geoJSON
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Min Scale: 0
Max Scale: 0
Supports Datum Transformation: true
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