Figure 2-10. Unit D: X-ray radiographs of selected cores from lithologic unit D in MP288c1. Each picture is a reproduction of the X-ray radiograph negative. Light tones represent areas or features that are dense to the penetration of X-rays. The radiographs are typical of the interbedded silty clays, silts, and fine sands that characterize unit D. The shales contain pyritized thin burrows (radiograph a) and nodular diagenetic masses that appear to be confined to burrows (radiograph e). Sands and silts are represented in this lithologic unit as intervals of deformed and convolute bedding as well as normally graded intervals that overlie shales (radiographs b, c, and d). On seismic profiles unit D is composed of the toes of upslope clinoform sets. Sediment gravity flows and slumping from prograding upslope deltas account for graded and deformed intervals. Each core is 7.6 cm in diameter.