1. Map showing the thickness and character of Quaternary sediments in the glaciated United States east of the Rocky Mountains, northern and central plains states (90⁰ to 102⁰ west longitude) / U.S. Department of the Interior, U.S. Geological Survey ; by David R. Soller Yale Public content 1997. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Information Services. English. Public. North Dakota, South Dakota, Minnesota, Iowa, and Missouri.