geologic mapping in northeastern illinois
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Geologic Mapping in Northeastern Illinois&&
What do we know about Lake County’s Geology?Lake County s Geology?
Donald A. Keefer, DirectorGeologic Mapping and Hydrogeology Center
Societal Benefits of MappingSocietal Benefits of Mapping• Water Supply Delineation, Protection and Managementpp y g• Aggregate Resource Delineation, Protection and
Management• Construction Engineering Guidance• Mineral Resource Delineation, Planning and
ManagementManagement• Development of Energy Infrastructure• Habitat and Wildlife ProtectionHabitat and Wildlife Protection
Mapping has an excellent cost to benefit ratio
ISGS Geologic Mapping in N h Illi iNortheastern Illinois
• Central Great Lakes Geologic Mapping Coalition (a.k.a. “The C li i ”) hi h l i 3 D i h h L k CCoalition”): high resolution 3-D mapping throughout Lake County; Federal and State funding
• STATEMAP Program: Lake, Cook, Kane, McHenry Counties; high l ti i f fi i l t i l F d l d St t f diresolution mapping of surficial materials; Federal and State funding
• Northeastern Illinois Water Supply Planning Region: regional geologic mapping for Fox River Basin sand and gravel aquifers and surficial bedrock aquifer regional characterization of deep bedrocksurficial bedrock aquifer, regional characterization of deep bedrock aquifer and confining unit; State funding
• Kane County: high to medium resolution 3-D mapping; County and State fundingState funding
• Kendall County: medium resolution 3-D mapping; County and State funding
Costs Vary with GeologyCosts Vary with Geology
• Costs are dependent on geologicCosts are dependent on geologic complexity
• Northeastern Illinois collar counties• Northeastern Illinois collar counties demonstrate range of issuesS b f l it ft diffi lt t• Subsurface complexity often difficult to estimate without new data
Water Supply Planning Regions
Water Supply Planning and ManagementManagement
State Geological Survey role:M i d h t i i• Mapping and characterizing– Deep Bedrock Aquifer– Confining units of Deep Bedrock Aquifer– Confining units of Deep Bedrock Aquifer– Glacial aquifers and surficial bedrock aquifer,
particularly within Fox River Basin– Glacial aquifers within and above Mahomet bedrock
valley (Mahomet aquifer system)• Create and improve 3-D geologic maps andCreate and improve 3 D geologic maps and
work with SWS colleagues to help integrate these into groundwater flow models
Water Supply Planning and MManagement
• Exploring new methods for bedrockExploring new methods for bedrock aquifer characterization
• Characterizing confining units• Characterizing confining units• Evolving 3-D geologic mapping approach
t i t t i ti f l i lto integrate existing maps of glacial deposits for large Fox River Watershed
Outwash sand & gravel units
Geologic MappingIn Kendall CountyIn Kendall County
Geology of Lake CountyGeology of Lake County
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ZIONANTIOCHFOX LAKE WADSWORTH
WAUKEGANWAUCONDA GRAYSLAKE LIBERTYVILLE
LegendLithostratigraphic units
Cahokia Formation (alluvium)
Disturbed Ground
Equality Formation (lake sediment
Grayslake Peat (organic)
Henry Formation (outwash)
Wadsworth Member (diamicton)
Haeger Member (diamicton)
Water
WHEELING HIGHLAND PARKBARRINGTON LAKE ZURICH
ZIONANTIOCHFOX LAKE WADSWORTH ZIONANTIOCHFOX LAKE WADSWORTH
WAUKEGANWAUCONDA GRAYSLAKE LIBERTYVILLE
LegendLithostratigraphic units
Cahokia Formation (alluvium)
Disturbed Ground
Equality Formation (lake sediment
Grayslake Peat (organic)
Henry Formation (outwash)
Wadsworth Member (diamicton)
WHEELING HIGHLAND PARKBARRINGTON LAKE ZURICH
Wadsworth Member (diamicton)
Haeger Member (diamicton)
Water
3D Geologic Mapping in Lake County, IL
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3D Geologic Mapping in Lake County, IL
ZIONANTIOCHFOX LAKE WADSWORTH
1
WAUKEGANWAUCONDA GRAYSLAKE LIBERTYVILLE
LegendLithostratigraphic units
Cahokia Formation (alluvium)
Disturbed Ground
Equality Formation (lake sediment
Grayslake Peat (organic)
Henry Formation (outwash)
Wadsworth Member (diamicton)
Haeger Member (diamicton)
Water
2
WHEELING HIGHLAND PARKBARRINGTON LAKE ZURICH
1
2
Aquifers of Northeastern Illinois
ChiDeKalb
West East
ChicagoDeKalb
Unconsolidated Aquifer System
Shallow Bedrock Aquifer
Deep Bedrock Aquifer SystemDeep Bedrock Aquifer System
Elmhurst-Mt. Simon AquiferCross-Section Modified from Bretz (1939)
Sand and gravel pit on the Fox RiverSand and gravel pit on the Fox River
Fractured DolomiteFractured Dolomite
<2,500 mg/L TDS
2,500-10,000 mg/L TDS
>10,000 mg/L TDS
Geologic Mapping in Northeastern Illinois&&
What do we know about Lake County’s Geology?Lake County s Geology?
Donald A. Keefer, DirectorGeologic Mapping and Hydrogeology Center