During previous Deep Sea Drilling Project (DSDP) and Ocean Drilling Program (ODP) legs on Shatsky Rise, recovery of Cretaceous units was hampered by the presence of chert intervals (Bralower, Premoli Silva, Malone, et al., 2002). One objective of ODP Leg 198 was to more successfully recover chert-bearing horizons using new drilling techniques such as the motor-driven core barrel. Despite these attempts, full recovery of these intervals remained elusive during Leg 198. However, short, relatively intact sections of chert and associated porcellanite and unaltered chalk were recovered throughout the Shatsky Cretaceous section (Berriasian to Maastrichtian) at Site 1207 on the Northern High and at Sites 1213 and 1214 on the Southern High (Fig. F1). Chert in the Cretaceous sections is highly variegated, with colors of pink, orange, red, brown, yellow, olive, gray, and black (Figs. F2, F3, F4). Cyclic changes in chert color across the Cretaceous interval were linked by shipboard scientists to changes in rates of sediment accumulation (Bralower, Premoli Silva, Malone, et al., 2002). Furthermore, some of these intervals were successfully logged, providing new information on the character and distribution of the chert intervals. This project is a petrological and geochemical study of these Cretaceous cherts and associated sedimentary rocks (porcellanite/chalk), focusing on chert color and its implications for depositional and diagenetic history. In particular, we document the nature (composition, mineralogy, and texture) of chert, porcellanite, and chalk/limestone at Site 1213. Note that the Aptian section containing the Selli oceanic anoxic event (OAE1a) is discussed elsewhere (Marsaglia, this volume).