Glacial deposits being sampled by underground drilling, Lake County, Illinois.

By National Cooperative Geologic Mapping Program 2020 (approx.)

Several people are seen standing near a large underground drilling rig.

Detailed Description

Glacial deposits are sampled deep underground by drilling (Lake County, Illinois). Geologists analyze sediments to determine physical characteristics, such as the capacity to hold and transmit water or ability to accept a load from a building or bridge.

Sources/Usage

Public Domain.

Photo by Illinois State Geological Survey.