IPGM - Worden-SG Supporting Information

3-D Quaternary Geology Model

The following is a 3-D model and fly-through of surficial (Quaternary) deposits in the Worden and northern Marine Quadrangles. This short one-minute movie was made in ArcScene 9.0 and shows deposits and paleo-surfaces that might be viewed as if above or below ground surface. The uppermost surface if the surficial geology map of this area (see PDF file). The bottom surface (in green shades) is the bedrock surface for this area. The middle surface (in grey) is the contact at the top of pre-Illinois Episode deposits, separating Glasford from Banner Formation. For most of the movie, you are flying between the ground surface and the bedrock surface.

The vertical colored lines represent water wells, coal borings, stratigraphic tests or engineering borings with geologic descriptions. Blue portions of the lines indicate clayey sediment. Red portions indicate sandy or gravelly sediments. Green portions indicate sandy clay. Purple portions indicate bedrock (limestone or shale generally). Yellow portions of lines are unknown – they do not have descriptions at these depths.

Note the occurrence of sand and gravel is some bedrock valleys. In many areas, two levels of aquifers occur. Typically, the upper aquifer is in Illinois Episode deposits and the lower is in pre-Illinois Episode deposits, but some are in younger modern valley deposits.

About Supporting Data

These supporting data files furnish detailed information about map features that are not normally included in the map or report. ISGS makes no guarantee about the accuracy of this unreviewed data, and users are urged to contact the author of the map before making any decision based on this information.