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As Bernoulli (1972) and Bernoulli and Jenkyns (1974) have shown, the Mesozoic facies of the western North Atlantic margin and those of the Tethyan Sea margins are very similar. In this paper I compare coeval facies and the sedimentary and tectonic evolution of both margins. My approach to the problem is not a narrow view; both groups of sediments have different features and must be studied in different ways, but the comparison is interesting because the study of both areas are complementary and enrich one another. The Atlantic sediments are from DSDP Holes 390, 391, and 392 (Figure 1). They are very well preserved and are neither greatly altered nor metamorphosed and they have not been subjected to tectonism. Moreover, their vertical succession is usually undisturbed and their approximate lateral extent and characteristics can be determined from seismic profiles. On the other side, the Alpine sedimentary rocks are always folded — often extensively, and are sometimes more or less metamorphosed. The continuity of an Alpine sequence is sometimes interrupted by thrusts or faults. Although in the higher altitudes — as is often the case in the Briançonnais mountains — the sedimentary succession is exposed in broad outcrops so that lateral and vertical variations may be easily studied. Finally, although it may seem strange to compare sediments which were deposited on an oceanic crust (Hole 391C) with those deposited on a continental crust (Briançonnais) such a comparison demonstrates that they share a similar geographic evolution. Because the Atlantic sediments are only known from drillholes, and also because the main purpose of this paper is to compare the evolution of both sedimentary environments, the Alpine series is described on the basis of certain characteristic sections. Figures showing these sections comprise the main results of the sedimentological analysis. The analyses are also discussed and interpreted in the text.

Mesozoic Evolution of Western North Atlantic and North Tethyan Margins: A Comparison