By X. Le Pichon, M. Melguen, J. C. Sibuet (auth.), Henry Charnock, Sir George Deacon (eds.)
The papers on the basic Symposia of the Joint Oceanographic meeting have been provided by means of authors who have been invited to house issues of wide interdisciplinary curiosity. jointly they gave a priceless account of the current nation of marine study, its proQlems and strength. There turns out advantage in publishing them in a single quantity and we're thankful to the authors who kindly agreed to organize their papers for booklet. This has taken it slow (and now not all authors came across it attainable) yet we are hoping the ensuing quantity continues to be indicative of developments in smooth oceanography. fairly visible is the way the utilized elements are starting to play a extra very important half regardless of concerns concerning the results of the legislations of the ocean on our freedom to make observations. we're in particular thankful to the 4 authors who agreed to provide lectures summarising the paintings of their personal box which used to be suggested on the meeting. We additionally desire to thank the opposite authors, in addition to all interested in the meeting and with the creation of this volume.
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Econ. Paleontologists and mineralogists, Houston, Texas, p. 140-151. N. , 1971. Elevation of ridges and evolution of the central eastern Pacific. J. Geophys. , 76 : 7888-7915. SCLATER, J. P. McKENZIE, 1973 : Paleobathymetry of the South Atlantic. Geol. Soc. Amer. Bull. v. 84, p. 3203-3215. , 1970. Nebenmeere in humiden und ariden klimabereich. Geol. Rundschau; vol. 73-105. J. P. E. , Initial Reports of the Deep Sea Drilling Project. S. Government Printing Office), p. 743-755. E. S. Government Printing Office), p.
1970). The CCD curve is shallower than the lysocline level of sites 17 and 19. Both sites are situated in the Angola basin, where the CCD is much deeper than in the Argentine and Cape basins. y. 26 X. LE PICHON, M. C. SIBUET - Lower Oligocene We have adopted a value of 3 000 m close to the 3 200 m of BERGER and ROTH (1975). The only available data is a Slightly higher degree of fragmentation of planktonic foraminifera (30 %) at site 360 at a paleodepth of 2 250 m (fig. 10). This suggests a level slightly above the lysocline, hence our choice.
Fig. 17, 18, 19, 20. Figure 18 shows that this is the stage of complete disruption of the different east-west topographic barriers. , fig. 15), there is already a 200 km gap between the well defined marginal fracture zones of the equatorial fracture zones. Similarly, to the south, the long Falkland-Agulhas fracture zone has already been broken and the opening enters into a new stage where it is not constrained any more by this strong Africa-South America coupling (LE PICHON and HAYES, 1971). The Walvis-Rio Grande barrier is still nearly continuous but the first gaps appear.