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Soil Horizons, 3(39), p. 61

DOI: 10.2136/sh1998.3.0061

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Soil Maps as a Tool in Mapping Poorly Preserved Landforms: A Case Study in Grand Forks County, North Dakota

Journal article published in 1998 by Eric C. Brevik ORCID, Thomas E. Fenton, John R. Reid
This paper is available in a repository.
This paper is available in a repository.

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Abstract

Several discontinuous, fragmented strandlines exist along what formerly was the western shoreline of glacial Lake Agassiz in Grand Forks County, North Dakota. Their fragmented nature makes mapping and correlation of these strandlines difficult. We have attempted to better define one of these strandlines, the Norcross, through the use of soil maps in the Soil Survey of Grand Forks County. Preliminary results of this study indicate that combinirig information from geological and soil maps could provide a means to bet-ter define poorly preserved landforms. Fieldwork is now needed to further support or refute these preliminary results. As topography and parent material are two of the soil-forming factors, soil scientists also stand to benefit from accurate geological maps. Given that each profession has the potential to benefit from the improved mapping of the other, it seems reasonable to suggest that there should be ongoing cooperation between parties mapping the geology and the soils in a common area. Lake Agassiz began to form against the retreating Red River Lobe of the Laurentide Ice Sheet about 11 700 years before the present (YBP) (Teller, 1990; Fenton et al., 1983), in a depression caused by the weight of the ice (Brevik, 1994, unpublished data). As the lake level fluctuated as a result of advances and retreats ofthe ice sheet, downcutting, and postglacial rebound, several strandlines (including beaches) were formed along Lake Agassiz's shores (Fig. 1). The pre-served sections of the strandlines tend to be slightly higher than the surrounding landscape (Brevik, 1997), usually about 5 to 25 ft (Bluemle, 1991), and in Grand Forks County trend to the north-northwest (Hansen and Kume, 1970). Many of these strandlines occur as discontinuous segments, often less than 3 mi long, and because of this it is difficult to trace and correlate them (Bluemle, 1991). One of these poorly preserved, fragmented strandlines is the Norcross. Grand Forks County, North Dakota, was chosen as our study area (Fig. 2). This county is ideal for this study for a number of reasons: (i) strandlines are eas-ily distinguishable from other landforms on soil maps; (ii) several strandlines have been clearly mapped by the North Dakota Geological Survey here, making it easy to locate and differentiate a number of strandlines; and (iii) several of the strandlines in the county are highly fragmented (Bluernle, 1991; Hansen and Kume, 1970).