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(JACKSON, Miss.) -- Starting in late February and running through early March 2018, the United States Geological Survey (USGS) will use a specialized instrument towed beneath a low-flying helicopter to collect data about the Mississippi River Valley Alluvial Aquifer in an area just north of Greenwood. The instrument is contained in a 30-foot long torpedo-shaped tube that will be suspended 100 feet below the helicopter, which will fly at an altitude of 200 feet. The data collected will allow scientists to better understand the properties of geologic layers beneath the land surface. Details of this data collection project are explained further in the attached USGS fact sheet. Additional information can be found at the following website: https://www2.usgs.gov/water/lowermississippigulf/map/geophysics.html.