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By Charles Edward Weaver, Kevin C. Beck

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Pure palygorskite is present in the dolomitic upper portion of the Tampa as far west as the central panhandle (Fig. 14). In the Trough area and slightly t o the east palygorskite and sepiolite are dominant in the upper portion of the Lower Miocene Torreya-Hawthorn. A second less-pure interval occurs near the middle of the Lower Miocene. This could be the top of the Tampa. South and slightly west of Tallahassee (Sopchoppy) the Sopchoppy limestone (Chipola or older), which was deposited in a restricted-marine environment (Huddlestun, 1976), contains palygorskite and trace amounts of montmorillonite.

George Island through the Appalachicola Embayment, down the axis of the Trough to the Savannah River. For location of wells see Fig. 24. Blank areas are predominantly carbonate rocks. Carbonates predominate to the southwest, and sand and clay to the northeast. 39 spar, These clay beds are largely detrital in origin and were deposited in a more normal-marine environment than the clay beds to the south. Detrital (grains and clasts of clay) palygorskite-rich clay in the Savannah area also contains both Na- and K-feldspar.

Southwest-northeast crosssection extends from west flank of Ocala High (near Tallahassee, Florida) down the nose of the High, across the Atlantic Embayment to South Carolina. Lower blank area is Suwannee limestone containing montmorillonite. The upper blank area is post-Miocene sand with a relatively high kaolinite content. Middle Miocene sediments contain diatoms and sponge spicules (D). It is absent south of the northeast edge of the High. Horizontal pattern = rnontrnorillonite; stipple pattern = palygorskitesepiolite.

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