Holocene-age alluvial deposits were studied on the Iowan Surface in a small perennial stream with a drainage basin of less than 45km2. Alluvial deposits were identified as members of the DeForest Formation. A 66m surveyed transect across Dry Run Creek Valley near the University of Northern Iowa revealed the presence of a Late-Wisconsinan surface and a Holocene floodplain. The Holoceneage deposits are found along the 31 m nearest the stream. Three holes were cored down to coarse gravel deposits into Holocene alluvium at regular intervals along the transect. The local water table was never reached in any of the core holes, so no organic material was obtained for radiocarbon analysis. Particle size and organic-carbon analyses were performed to help characterize properties of the alluvium and soils. Our interpretations of the loamy sediments show three units of the Roberts Creek Member of the DeForest Formation. This interpretation is based on texture, color, location within the valley, and degree of soil development. No Gunder Member or Camp Creek Member is present along the valley cross-section. The results indicate that alluvium in Dry Run Creek Valley is similar to alluvium in other small valleys in eastern Iowa.
Conference Proceedings: Undergraduate Social Science Research Conference
©2003 by the University of Northern Iowa
University of Northern Iowa
Cedar Falls, IA
Koch, Jesse; Krantz, Alan; and May, Dave
"Holocone Alluvium in a Third-Order Stream on the Iowan Surface,"
Conference Proceedings: Undergraduate Social Science Research Conference: Vol. 7:
1, Article 41.
Available at: https://scholarworks.uni.edu/csbsproceedings/vol7/iss1/41