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Correlation by Ordovician Bentonite
The Journal of Geology
Vol. 40, No. 6 (Aug. - Sep., 1932), pp. 522-534
Published by: The University of Chicago Press
Stable URL: http://www.jstor.org/stable/30058026
Page Count: 13
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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.
The Journal of Geology © 1932 The University of Chicago Press