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Isopachous Map and Study on Thickness of Peorian Loess in Nebraska¹

ABSTRACT

An isopachous map showing the thickness of Peorian loess in most of eastern and southern Nebraska was prepared from test hole data secured in groundwater investigations. The data from over 1,200 test holes was plotted and isopachous lines were then imposed to show the relative thickness of the loess mantle.

The deepest loess plotted was from 80 to 90 feet thick near the Sandhills and it became progressively thinner to the south and east. Immediately south of the Platte River valley the loess ranged from 40 to 60 feet thick and became thinner to the south and east. This study covered data for approximately 50 counties.

¹ This study was supervised by Dr. Robert G. Bowman, Dept. of Geography, University of Nebraska as a research study in Physiography. E. C. Reed, Director and State Geologist, Conservation and Survey Division, University of Nebraska, and V. H. Dreeszen, Asst. Director of Conservation and Survey Division, assisted with interpretation of the data. Presented before Div. V, Soil Science Society of America, Cornell University, Ithaca, N. Y., Aug. 21, 1962.

² Assistant State Soil Scientist, Soil Conservation Service, USDA, Lincoln, Nebr.

Accepted for publication November 19, 1962.