The Campanian and Maastrichtian sequence on Ontong Java Plateau (OJP) presents many frustrations for paleoceanographic study, but it also provides a view on conditions in a portion of the Cretaceous tropical to subtropical Pacific for which better samples are not available. Frustrations include coring gaps, deep burial, and high degrees of lithification. However, the presence of multiple holes in the same region increases the available record and allows comparison of patterns within and among sites so that paleoceanographic and diagenetic signals can begin to be separated. Trends repeated at all sites despite different burial histories likely reflect paleoceanographic events. Differences in values or trends among sites could represent local signals. Especially where they depart from expected paleoceanographic values, though, they are more conservatively interpreted as the result of alteration. As such, these differences can be used to estimate the direction and magnitude of diagenetic overprints.