sentences:  This is followed by a long depositional hiatus before sedimentation resumes ~6.5 Ma (Late Miocene), with deposition of volcanic ash, clay, and windblown dust.The stratigraphy east of the Mariana segment differs from that being subducted beneath the Izu-Bonin segment in having a much greater abundance of Early Cretaceous intra-plate volcanics and flood basalts.About 470m of oceanic crust was penetrated at ODP site 801C during Legs 129 and 185.