A Kame Field of Iowan Age in the Vicinity of Grand Mound and De Witt, Clinton County, Iowa

Numerous low mounds of irregular shape in the v1cm1ty of Grand Mound and De Witt, Iowa, are glacial features coming under the category of kames. Twenty-two kames have been identified within an oblong area about two or three miles wide and 12 miles long, lying immediately south of the Chicago, Northwestern railroad and U. S. Highway 30 (see Figure l). The area extends eastward from about two miles east of the town of Calamus, passing south of the town of Grand Mound and continuing two miles southeast of the city of De Witt. Parts of the kame field lie in Olive, Orange and De Witt townships, Clinton county

A New Outcrop of the Rockville Conglomerate

During the summer of 1953, an outcrop of ferruginous pebble conglomerate was found in central Jones county, Iowa. This outcrop is located about three miles north of the town of Olin, along the eastern edge of Iowa Highway 38 between Olin and the junction of Highways 38 and 64. It is near the center of the SE¼ of section 25, T. 84 N., R. 3W. (Jackson Township) Jones County. Topographically, it occurs about midway up the gentle north side of the valley of the Wapsipinicon River. The rock at this locality extends horizontally for about thirty feet and has about five feet of its thickness exposed. Along the tops of the exposed bedding planes, weathering has produced a mottled black-gray color. On fresh surfaces and on some of the vertical fractures, the rock is light-gray, pale yellow-brown, or dull-red in color

Morphometric Study of Two Drainage Basins Near Iowa City, Iowa

A morphometric study was made of the adjoining drainage basins of east-flowing Old Man Creek and Clear Creek in Johnson and Iowa counties, Iowa. In terms of the parameters measured, these basins are essentially similar. They agree with laws for drainage basins proposed by Horton and are therefore normal rather than misfit . Part of the Clear Creek basin was invaded by Iowan ice and this probably accounts for some abnormal data. Distinct longitudinal asymmetry and obviously steeper south valley walls are probably best explained by the differences in loess thickness on valley sides

Large Erratics in Jasper County, Iowa

Large granite erratics, formerly attributed to the Iowan, are believed to be associated with the Kansan drift. Now located within valleys, they have remained after considerable Kansan till has been eroded

A Massive Chert Bed in the Hopkinton Formation and an Associated Boulder Train Near Strawberry Point, Clayton County, Iowa

Feulner, while mapping the bedrock of Clayton county during the summer of 1951, observed numerous large chert erratics scattered over the landscape west of Strawberry Point. These erratics lie near the edge of the Iowan drift plain just south of the northfacing Niagaran escarpment, which is formed by the erosion of Silurian rocks

Differentiation of Drift Topographies By Statistical Analysis of Slope Data

The purpose of this study is an investigation of slope development by statistical analysis of slope angle, slope length, relief and stream gradient data developed on four different glacial drift deposits in Iowa. Measurement from randomly selected points on 1:24,000 topographic maps provide the data. Analysis of variance is used with both F-ratios and between-group t-tests. Differences from comparisons based on the age of the different glacial drifts were found to be significant for all parameters. Significant differences were also found for some of the variables in comparisons based on physiographic classification, stream order of the nearest stream, and orientation of the slope. Relationships among the variables are indicated by correlation coefficients with significance determined by t-tests

The Distribution of Climatic Factors in Iowa and Their Influence on Geomorphic Processes

This paper undertakes to evaluate effects of climate upon geormorphic processes in Iowa. Iowa\u27s climate is described as humid continental long summer, with three-fourths of the annual precipitation falling between the end of March and the beginning of October. In almost all climatic factors, the variation trends or changes from the north-northwest toward the south-southeast. Using the two parameters of mean annual temperature and mean annual rainfall for 119 stations in Iowa, a scattergram was constructed. Statistical analyses of the data suggest the presence of three microclimatic zones or regions in Iowa--northern, central, and southern. Comparisons of climatically controlled aspects of erosion and weathering showed that (1) drainage composition has had greater development in the south; (2) climatic factors affect the distribution and transportation of the dissolved and suspended load in streams: (3) soils of similar type and origin are more mature and have undergone more leaching of potassium, magnesium, and phosphorus in the southeast than in the northwest; (4) employment of the universal soil loss equation indicates that more soil is likely to be removed per acre by erosion in the southeast than in the northwest. In comparing degrees of erosion and weathering between the three microclimatic regions, slight differences become apparent, indicating that in terms of climatic geomorphology, these regions are distinct

Geomorphology in Iowa 1943-1968: An Annotated Bibliography of the Literature

A study of what has been written about the geomorphology of Iowa since the publication of the Kay volume, The Pleistocene of Iowa, in 1943, resulted in the compilation of an annotated bibliography. An examination of the subject material and procedures described suggests: studies since 1943 are process oriented rather than time oriented; increased use of paleosols and buried erosion surfaces; introduction of radiocarbon dating; and a lack of discussion about a framework for geomorphology

Tables and graphs of measurements made across four Cape Cod beaches 1957-1958

Originally issued as Reference No. 61-4, series later renamed WHOI-.The primary purpose of this report is to present tables of measurements made across four Cape Cod beaches.The field work was supported entirely by the Geography Branch of the Office of Naval Research under contract number Nonr-1254 (00) (NR-388 - 018)