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A total of eleven thin-sections were produced from Tallahatta Chert samples collected during the study. Tallahatta Chert is colorless in thin section with minor mottling by limonite and other iron oxides/hydroxides. Fracture planes, some lined in iron oxide, are also common in some specimens. Under crossed Nichols, a fine layering between chert (the dominant material) and chalcedony can be seen in some thin sections, particularly those produced from variegated speciemns. Chalcedony also fills once isolated pores resulting in rosette-like clusters in some areas of the thin sections. Fossil shells and "ghost" grains can be seen in some thin sections suggesting that silicification was fabric-preserving at times. Overall, however, thin sections of Alabama Chert are unremarkable. |
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