Bentonite from the Eocene Castle Hayne Limestone
Paul A. Thayer, W. Burleigh Harris, Victor A. Zullo, 1986. "Bentonite from the Eocene Castle Hayne Limestone", Southeastern United States: Third Annual Midyear Meeting, 1986, Raleigh, North Carolina, Daniel A. Textoris
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Westward expansion of the Fussell Ouarry (see Fig. 5 of Road Log for location) has exposed a dark-gray clay lens in Castle Hayne Limestone. The clay is composed mainly of smectite, and by currrently accepted usage (Grim and Guven, 1978) can be termed bentonlte. This paper reports a geochemical, mineralogical and petrographical study of the bentonite and demonstrates its derivation from volcanogenic sediment.
Bentonite samples were studied by a variety of techniques, including: X-ray radiography; X-ray diffraction (XRD); scanning electron microscopy (SEM) with an energy dispersive X-ray analyzer (EDX); chemical analyses by X-ray fluorescence (XRF) and wet chemistry; and petrographic modal analyses of smear slides, thin sections and grain mounts.
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Southeastern United States–Guidebook is comprised of twelve field trips that were organized for the Third Annual Midyear Meeting held in Raleigh, North Carolina in 1986. The spectrum of geologic time represented in the Upper Precambrian, Lower Paleozoic, Mesozoic, Cenozoic and the very Recent. The geologic provinces are the Valley and Ridge, Blue Ridge Mountains, Piedmont, and the Coastal Plain. Besides North Carolina, trips include Virginia, South Carolina and West Virginia.