Illinois Geologic Quadrangle (IGQ) Maps
Most Illinois Geologic Quadrangle (IGQ) maps originally were produced as STATEMAP or Illinois Preliminary Geologic Map products; some were derived from other mapping activity. In addition to bedrock and surficial geology, this series may include a variety of geologic themes such as bedrock topography, drift thickness, and others. IGQ maps are available for sale as hard copy and as free downloadable graphics through this website. Digital (GIS) data are available for some of these geologic maps. They are extensively reviewed, internally and externally, and comply with ISGS cartographic standards at the time of public release.
Quadrangles
Alton
Ames
Aurora North
Bandana
Beecher West
Bethalto
Bloomfield
Brownfield
Cahokia
Cairo
Carbondale
Carrier Mills
Cobden
Columbia
Crab Orchard
Crab Orchard Lake
Creal Springs
Crystal Lake
Cypress
Dongola
Eddyville
Elburn
Elgin
Elsah
Equality
French Village
Geneva
Glendale
Goreville
Grafton
Grand Detour
Grantfork
Hampshire
Herrin
Johnston City
Jonesboro
Joppa
Karbers Ridge
Karnak
Lick Creek
Makanda
Marion
Mascoutah
McClure
Mermet
Metropolis
Mill Creek
Mt. Pleasant
Naperville
New Athens East
Oak Hill
Oraville
Paducah NE
Paderborn
Pingree Grove
Pittsburg
Prairietown
Red Bud
Reevesville
Renault
Rome
Rudement
Saline Mines
Shawneetown
Spring Bay
Steger
Stonefort
Sugar Grove
Valmeyer
Villa Grove
Vincennes
Waltersburg
Ware
Waterloo
Welge
Wolf Lake
Other ISGS map Series
Updated 07/18/2012 SLD