Montmorillonite-Vermiculite Interstratification in Clays from Eocene Chalk Soils.
Soils of the Eocene chalk often show interstratification in their clay fractions, though discrete 14- and 18-A spacings are the rule rather than the exception. It is also frequent that a 16-A intermediate shows in place of these diffraction maxima. This intermediate is indicative of complex interstratification. It is a unique feature of this body of soils and a strong indication that existing data on random and regular interstratification are both correct and diagnostic. The rare but interesting diffuse spacings spacings which are observed at 22 A are another unusual feature of the clays of this group of soils.
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