This question is based on Figure 45-4, a stereogram of the Stovepipe Wells region of Death Valley, California, Figure 45-5, a portion of the "Stovepipe Wells, California" quadrangle (scale 1:62,500; contour interval 80 feet; north is to the left side of the stereogram and topographic map), and Map T-27a, color aerial imagery of this same region of Death Valley

This question is based on Figure 45-4, a stereogram of the Stovepipe Wells region of Death Valley, California, Figure 45-5, a portion of the "Stovepipe Wells, California" quadrangle (scale 1:62,500; contour interval 80 feet; north is to the left side of the stereogram and topographic map), and Map T-27a, color aerial imagery of this same region of Death Valley. Several large alluvial fans that come out of the Tucki Mountains are coalescing to form a bajada (36°35′17″N, 117°06′35″W2).

What are the braided markings on the faces of the fans? (Hint: Think about how alluvial fans form.)?