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GSA Special Papers
Late Quaternary History of the Lake Michigan Basin
Author(s)
Geological Society of America

Volume
251
Copyright:
© 1990 Geological Society of America
Geological Society of America
ISBN print:
9780813722511
Publication date:
January 01, 1990
Book Chapter
Systematic variation in the clay-mineral composition of till sheets; Evidence for the Erie Interstade in the Lake Michigan basin
Author(s)
-
Published:January 01, 1990
X-ray diffraction analyses of till samples collected from multi-till exposures along the Lake Michigan shoreline in Michigan and Wisconsin show a systematic variation in the clay-mineral composition of successive till sheets. A general increase in the relative amount of 10Â clay occurs within a succession of till sheets, beginning with early or middle Wisconsinan Glenn Shores till and continuing through late Wisconsinan (Woodfordian) Ganges–New Berlin till and Saugatuck–Oak Creek till. A significant decrease in the relative amount of 10Â clay, however, occurs within the post–Mackinaw Interstade (late Woodfordian) Ozaukee-Haven and Two Rivers tills. These changes in clay-mineral composition are apparently...
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Index Terms/Descriptors
- areal studies
- chlorite
- chlorite group
- clastic sediments
- clay mineralogy
- clay minerals
- correlation
- deglaciation
- geomorphology
- glacial features
- glacial geology
- grain size
- Great Lakes
- Great Lakes region
- illite
- kaolinite
- Lake Michigan
- Michigan
- North America
- sedimentary petrology
- sediments
- sheet silicates
- silicates
- smectite
- till
- United States
- vermiculite
- Wisconsin
- X-ray diffraction data
- Saugatuck-Oak Creek Till
- Mackinaw Interstade
- Ozaukee-Haven Till
- Erie Interstade
- Ganges-New Berlin Till
- Powell Moraine
- Two Rivers Interstade
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