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Cored sections from three sites (327, 329, and 330) on the eastern elevated part of the Falkland Plateau (the Maurice Ewing Bank) are correlated by means of two complementary reflection profiles which pass through all three sites. Limitations are imposed upon the precision of the correlation by defects of sampling at the sites and by the characteristics of the reflection profiles, but the results are of value. None of the principal conclusions drawn from preliminary studies of the cored material is contradicted by the analysis and most are confirmed or extended. In particular, the Mid to Late Jurassic marine transgression observed at Site 330 is put into context, as being sampled on a basement high close to the margin of a 1.5 to 2 km deep basin floored probably by continental crust. This dichotomy of shelf and basin province, which may apply over the entire plateau, was in existence by the Late Jurassic and has remained undisturbed by relative movement since that time. The restricted circulation evident in Upper Jurassic and Lower Cretaceous sediments on the shelf probably occurred also throughout the basin province and implies confinement during that period by land barriers to the south and west. In the early Albian circulation improved, as the Maurice Ewing Bank subsided and as a deep-water connection was made to the east between the developing South Atlantic and Indian oceans. These events resulted in largely pelagic sedimentation at the site, tending to degrade the topographic distinction between shelf and basin, which earlier, largely terrigenous sedimentation had preserved. An Upper Cretaceous condensed section suggests nondeposition below the CCD, rather than erosion, but a gradual increase in bottom currents from the Maestrichtian through the Cenozoic is evident in the profiles. The sea bed at present is of all ages from Late Cretaceous to late Miocene in the vicinity of the sites, a result of submarine erosion, largely if not entirely of Neogene age. It is speculated that the greater part of the sedimentary fill in the basin province is of biogenic oozes of Maestrichtian and Paleogene age, continuous with similar sediments on the shelf (elevated region) before the period of submarine erosion. Although the data are consistent with a mid-Cenozoic opening of Drake Passage, many other secondary factors may have influenced sedimentation, and it is not possible at the sites or along the line of section to make a more precise estimate of when a consequent sharp increase in the strength of bottom currents might have taken place.

Correlations between Sites on the Eastern Falkland Plateau by Means of Seismic Reflection Profiles, Leg 36, DSDP