There are only a few ways to obtain sediment samples from beneath these lakes: hand augering in the late fall,  								drilling from a floating platform (barge) during the summer, or drilling with a truck mounted rig in the winter when the lake has sufficiently frozen. The North Dakota Geological Survey  								chose to drill in the winter and had to contend with temperatures that ranged from 30 to -24 degrees Fahrenheit). (Photo by E. Murphy, NDGS).
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