Physical and mineralogical variations in the Yorkville Till member, Grundy and adjacent counties, Illinois

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dc.contributor.advisor Roepke, Harlan H. en_US Killey, Myrna Marie en_US
dc.coverage.spatial n-us-il en_US 2011-06-03T19:32:44Z 2011-06-03T19:32:44Z 1980 en_US 1980
dc.identifier LD2489.Z78 1980 .K54 en_US
dc.description.abstract This study has confirmed the existence of a distinct mineralogical component in the upper part of the Yorkville Till Member of the Wedron Formation of Wisconsinan age in northeastern Illinois. This upper till unit occurs within the area of, but is not bounded by, the older Marseilles Morainic System and the younger, overriding Minooka Moraine. The analyses of samples from 79 locations that were used to identify, compare, and differentiate the two tills were: matrix grain size, clay mineral composition, carbonate content, and color.The upper till is a grayish brown, silty clay till with 76% illite and a dolomite-calcite ratio of 2:1. The lower till is an olive gray, silty clay till with 81% illite and a dolomite-calcite ratio of4:1. Results of this study indicate that (1) the two tills are separable and mappable units with the aid of laboratory data; (2) the lower till composes the bulk of the Marseilles Morainic System; (3) the upper till is thin between the moraines and constitutes the till of the Minooka Moraine; and (4) the upper till apparently represents a minor readvance and a concurrent change in source material.Ball State UniversityMuncie, IN 47306 en_US
dc.format.extent x, 156 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Drift -- Illinois. en_US
dc.subject.lcsh Geology, Stratigraphic -- Pleistocene. en_US
dc.subject.lcsh Geology -- Illinois. en_US
dc.subject.other Ball State University. Thesis (M.S.) en_US
dc.title Physical and mineralogical variations in the Yorkville Till member, Grundy and adjacent counties, Illinois en_US Thesis (M.S.)--Ball State University. en_US
dc.identifier.cardcat-url en_US

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  • Master's Theses [5510]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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