A petrologic study of texture, including apposition fabric and mineral composition was made of the Sewanee Sandstone, to deduce petrogenesis. The homogeneous quartzose sandstone was formed under tectonically stable conditions in transitional depositional environments. Source rocks, mainly to the east (present Piedmont), were igneous plutonic rocks, with metamorphic rocks secondary and sedimentary rocks minor. Diagenetic changes are discussed. A method for sampling and measuring preferred orientation of sand grains is described. Regional mean directions of preferred grain orientation and cross bedding are fairly consistent and coincident. Variations of apposition fabric are greater locally than regionally.

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