The dark-stained ring of rocks shown here is the central pit of a small “ring midden,” a donut-shaped plant baking facility dating to about A.D. 1300. This midden (site 41BX216) is one of many similar features found in Musk Hog Canyon in western Crockett County on the western edge of the Edwards Plateau. The form and function of middens here is obvious in part because most of them date very late in prehistoric time and because most of them weren’t used very long. In contrast, many of those in the eastern Plateau were used many more times over longer periods, masking the same basic structure. TARL archives.