Sinkholes in Illinois
March 13, 2013 | Illinois Geological Survey
The Illinois Geological Survey has a publication titled: Karst Landscapes of Illinois. From the publication "Two conditions are necessary for karst landscapes (green areas on map): (1) Soluble rocks, generally limestone and dolostone, must lie at or near the surface of the ground. (2) The loose soil covering the soluble bedrock must be thinner than about 50 feet."
Niagara Falls Without Water
September 5, 2013 | NBC News
NBC News has a collection of photo of Niagara Falls from 1969 when the flow of water to the American Falls was diverted over the Horseshoe Falls or to the Robert Moses power plant.
Illinois Severance Taxes and Drilling Fees?
March 19, 2013 | ShaleReporter.com
An article in the ShaleReporter reviews proposed drilling fees and a severance tax on wells that will use hydraulic fracturing to tap the New Albany Shale and similar rock units in Illinois.