Description: Natural Gamma-ray Logs in Unconsolidated Sediments, 2012 (1:100,000) - Natural gamma-ray logs can be used to interpret the character and thickness of shallow unconsolidated materials. These data show the availability of paper gamma-log records and physical samples that were collected by the Indiana Geological Survey between 1978 and 2012. Data are current as of May 9, 2012.