Illinois Geologic Quadrangle (IGQ) Basic Digital Data Products
Access IGQ Basic Digital Data Products free-of-charge. Images offered via the links below are not cartographic products, they merely portray the general nature of the data.
Alton Surficial Geology
(1.4Mb)
Surficial geological units of the 7.5-minute Alton Quadrangle in Madison County, Illinois. Vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, loess thickness contours, cross-section line locations, and data point locations for stratigraphic test holes, outcrops, ISGS field notes, water wells, and engineering borings.
Elburn Surficial Geology
(1.7Mb)
Surficial geological units of the 7.5-minute Elburn Quadrangle in Kane County, Illinois. Vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, cross-section line locations, water bodies and data point locations for stratigraphic test holes, outcrops, ISGS field notes, water wells, and engineering borings.
Elsah Surficial Geology
(1.1Mb)
Surficial geological units of the 7.5-minute Elsah Quadrangle in Jersey and Madison Counties, Illinois. Vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, cross-section line locations, and data point locations for stratigraphic test holes, outcrops and water wells.
Geneva Surficial Geology
(1.4Mb)
Surficial geological units of the 7.5-minute Geneva Quadrangle in Kane County, Illinois. Vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, cross-section line locations, and data point locations for outcrops, water wells, engineering borings, ISGS borings and IDOT borings.
Grafton Surficial Geology
(1.4Mb)
Surficial geological units of the 7.5-minute Grafton Quadrangle in Jersey and Calhoun Counties, Illinois. Vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, cross-section line locations, and data point locations for stratigraphic test cores, outcrops, water wells and engineering borings.
Villa Grove Aquifer Sensitivity
(1.3Mb)
Aquifer sensitivity to contamination in the 7.5-minute Villa Grove Quadrangle in Douglas County, Illinois. Vector spatial data layers in ArcView shape file format for aquifer sensitivity units and sensitivity class boundaries.
Villa Grove Bedrock Geology
(1.3Mb)
Bedrock geological units of the 7.5-minute Villa Grove Quadrangle in Douglas County, Illinois. Vector spatial data layers in ArcView shape file format for bedrock geologic units, contacts, and data point locations.
Villa Grove Bedrock Topography
(600Kb)
Bedrock topography of the 7.5-minute Villa Grove Quadrangle in Douglas County, Illinois. Vector spatial data layers in ArcView shape file format for bedrock topography polygons and contours, and data point locations for stratigraphic test cores, water wells, petroleum borings and coal borings.
Villa Grove Drift Thickness
(1.7Mb)
Thickness of Quaternary deposits in the 7.5-minute Villa Grove Quadrangle in Douglas County, Illinois. Vector spatial data layers in ArcView shape file format for drift thickness polygons and contours.
Villa Grove Surficial Geology
(1.6Mb)
Surficial geological units of the 7.5-minute Villa Grove Quadrangle in Douglas County, Illinois. Vector spatial data layers in ArcView shape file format for surficial geologic units and contacts, indications of morainal units and units overlain by loess deposits, and data point locations for test borings (shallow and deep) and engineering borings.
