The Leg 171A investigations provided a venue for new investigations and reconsideration of previous interpretations in the context of the new logging data. The site-by-site results and some broader conclusions are documented in the Leg 171A Initial Reports volume (Moore et al., 1998a). Results summarized here draw on articles mostly published in the outside literature. The results are presented in three sections: the first focusing on correlations and derived properties of the logs, and the following two sections considering results primarily applicable to areas seaward, or east, of the accretionary prism and to those landward, or west, of the toe of the accretionary prism.