Deep-sea drilling on the upper continental rise off New Jersey, DSDP Sites 604 and 605

摘要: Deep Sea Drilling Project Sites 604 and 60S on the upper continental rise are first of a series cored holes along “New Jersey transect” which, when completed, will provide comprehensive dipwise suite drill across passive margin from coastal plain to abyssal plain. Our drilling results document age important seismic sequence boundaries allow their correlation with wells shelf slope as well regional oceanic stratigraphy. Hole 605,156 km (97 mi) southeast Atlantic City, New Jersey, drilled 816.7 m down mid-Maestrichtian limestones, penetrated near-complete Cretaceous/Tertiary boundary section overlain by 200-m expanded Paleocene sequence. Unusually high amounts terrigenous silts glauconite present at immediately above. Among several hypotheses discussed, we suggest that may represent high-energy event such tsunami caused impact. Site 604, 5 (3 seaward 605, was terminated in Miocene glauconitic sands debris flows 294.5 unstable hole conditions. These sediments contain shelf-derived gravels exotic blocks Eocene chalk (up 50 cm across) eroded bedrock is today widely exposed adjacent slope. show denudation units not limited Oligocene A u erosional event, but major loss occurred during late later glacial sea-level lowstands.