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In this Initial Report of the Deep Sea Drilling Project, detailed studies of Sites 533 (gas hydrates) on the Blake Outer Ridge and 534 (oldest ocean history) in the Blake-Bahama Basin have provided answers to many geological and geophysical questions posed over the decade that deep drilling has been undertaken in this part of the western North Atlantic. The history of drilling and a historical review of key scientific accomplishments have been presented in the Introduction (Gradstein and Sheridan, this volume). In this final chapter we review highlights of new geological, geophysical and paleoceanographic interpretations presented in this volume, and offer a critical review of this information. We conclude with a listing of some outstanding problems and recommendations for future research, including data collection. The following subjects are addressed: (1) summary of Sites 533 and 534—litho-, bio-, magneto-, and seismostratigraphic interpretations (Figs. 1-3); (2) the quest for the oldest oceanic sediments (Fig. 4); (3) the age of basement at Site 534; (4) the Jurassic time scale and a stratigraphic synthesis chart for the western North Atlantic (Figs. 5, 6); (5) implications for early spreading rates and the age of the Blake Spur Marine Magnetic Anomaly (BSMA) (Fig. 7). (6) implication of the age of the Blake Spur Marine Magnetic Anomaly (BSMA) to the North American margin; (7) pulsation tectonics; (8) 160 m.y. of subsidence and sedimentation and the controversy around the Cenomanian-Miocene gap in the ocean record (Figs. 9, 10); (8) sediment accumulation at Site 391 and at Site 534, as well as Late Cretaceous to Paleogene deposition and erosion, or nondeposition in the Blake-Bahama Basin; (9) Jurassic paleogeography and paleocirculation (Fig. lla-c); (10) black shales depositional models and hydrocarbon source potential (Fig. 12); (11) seismic stratigraphy of the Blake-Bahama Basin; (12) origin of the mass flow deposits of the Miocene Great Abaco Member and the Eleuthera Fan complex; (13) gas hydrates on the Blake Outer Ridge; (14) heat flow in the Blake-Bahama Basin; (15) contourite formation of the Blake Outer Ridge; and (16) recommendations for future drilling and research. SITES 533 AND 534—SUMMARY OF ACCOMPLISHMENTS

On the Jurassic Atlantic Ocean and a Synthesis of Results of Deep Sea Drilling Project Leg 76