Active wind-driven erosion is also evident from yardangs, which are generally composed of well-sorted, yellowish to reddish medium sands. Their base is formed by whitish grey sands (Fig. 5a), and they rest on reddish and more resistant poorly sorted sandy to
gravelly sediment with signs of strong post-depositional pedogenic overprinting in the form of carbonate cementation, patches(Fig. 5e) and coatings (Fig. 5f).