Coalition in Action

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  	Illinois State Geological Survey (ISGS) geologists and the State of Illinois are featured in the History Channel's internationally popular program, How the Earth Was Made: America's Ice Age which aired March 9. The geologists lead the search across Illinois for evidence of glaciation which played a defining role in the geography and consequently the economy of Illinois and the U.S.
  	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.
  	Geophysical surveys at the land surface help scientists explore the subsurface geology. Here geologists collect geophysical data using geophones. In the resulting geophysical profile, colors highlight key horizons.