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Correlation by Ordovician Bentonite

Lawrence Whitcomb
The Journal of Geology
Vol. 40, No. 6 (Aug. - Sep., 1932), pp. 522-534
Stable URL: http://www.jstor.org/stable/30058026
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Correlation by Ordovician Bentonite
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Abstract

It is postulated that the Ordovician bentonite beds of Eastern North America were derived from numerous local, rather than one centrally located volcano. Six criteria, which should be considered in any attempt to correlate bentonite beds, are given. In central Pennsylvania a correlation has been established between the bentonite beds over an area which is 70 miles along the strike and 23 miles across the structure. A datum plane has been established throughout the area which cannot vary in age by more than a day or two.

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