FIGURE 15. Fryxell photo 106, showing the 1973 trench from 13E to 9.5B. Level 2061 is marked by a string just below the middle. Above a dark lenticular layer of clay at the center and extending to the right are channel deposits designated as Units B, C, and E by Irwin-Williams (1967a), which yielded bifacial artifacts. These are steeply overlain at the center and to the left by southward dipping sandy beds. Because these beds flatten to the south and become clayey, they were described as "Sand grading laterally to clay" (Steen-McIntyre et al., 1981).