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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)


Journal of Sedimentary Petrology
Vol. 28 (1958)No. 3. (September), Pages 345-350

Electron Micrography of Till Matrix

John B. Droste, George W. White, Albert E. Vatter


Wisconsin tills Previous HitfromNext Hit northeastern Ohio were studied under the electron microscope as fragments Previous HitfromNext Hit less than 1 to several microns and on surfaces as large as 1/4 inch, using carbon replica techniques. Subhedral "grains" are composed of illite and chlorite; anhedral "grains" are kaolinite. Kaolinite is absent Previous HitfromNext Hit "late" Cary (just pre-Defiance) till. Nonclay minerals, quartz, feldspar, and calcite, are either absent or exceedingly rare in less than 2 micron sizes, but increase in amount in larger sizes and are common in larger than 4 micron grain sizes. The platy clay minerals are oriented more or less parallel to the horizontal plane of the till in place.

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