How to View the Natural Gamma-Ray Logs Database
The natural gamma ray logs are available in Portable Document Format (PDF) and can be down loaded to a computer or viewed in a Web browser using Adobe Acrobat Reader. Logs are available only in the highlighted counties.
- Use Adobe Acrobat Reader to view the logs.
- It is not possible to bookmark the map views; bookmark the main page instead
How to Use the Interactive Mapping Interface
Map manipulation tools are located on the left side of the interface. The currently selected tool is outlined in red. Data layer visibility and activation controls are located on the right side of the interface. The natural gamma-ray log layer must be set to active status to view a geophysical log.
Step 1: Zoom in to a county of interest
The Zoom In tool is selected by default when the interface is launched. Boreholes with natural gamma-ray logs are shown in yellow.
Step 2: Use the “Select Within Records” tool to view
the attributes of a layer
Attribute data for selected borings are listed in the lower frame of the map interface. Attribute fields are described at the bottom of the page.
Step 3: View the digital image using the Hyperlink tool
A digital image of the log can also be viewed by selecting the text in the PDF field.
Interface Navigation Tools
List of Attribute DataAPI Number: A unique number assigned to the boring by the ISGS
Well Name: The name given to the boring by the geologist in the field.
Quarters, Section, Township, Township Direction (TWP Dir), Range, and Range Direction (RGE Dir): Components for legal description of a boring's location More information on how well locations are described in Illinois.
Elevation: Ground surface elevation in feet.
Quadrangle: The 7.5-minute quadrangle where the boring is located
Total Depth: Total depth of boring
Updated 11/19/2010 SKB