Sinkholes in Arizona
March 10, 2013 | Tucson Citizen
The Tucson Citizen has an article about sinkholes in Arizona. Like in Florida, karst features in Arizona can develop over limestone, but gypsum and salt can also support karst topography.
Publications from the Arizona Geological Survey include:
Home Buyer's Guide to Geologic Hazards in Arizona
Land Subsidence and Earth Fissures in Arizona
Illinois Golfer Falls into Sinkhole
March 13, 2013 | St. Louis Post-Dispatch
A golfer fell into a sinkhole while playing a course near Waterloo, Illinois - fortunately the 18-foot fall left him with only minor injuries. The course is over shallow, cavernous limestone.
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.