Abstract
The reconstructions of Mesozoic pre-drift arrangement of tectonic units, grounded on the geological and geophysical data and on the fit of continental slope contours, were compiled for the regions of the sea of Japan, the South China sea, the Tasman and Caribbean seas and the Gulf of Mexico. These reconstructions confirm a supposition that the basins of marginal seas were formed by the tension and break of the continental crust. In the deep basins a crust of oceanic type was formed by the sea floor spreading. The tension and rupture of the earth's crust was due in most areas of marginal seas to the drift of island arcs from the continent towards the Pacific, but in other areas (the Gulf of Mexico, the Caribbean and Tasman seas) it was connected with the removal of adjacent large continental blocks (N. and S. Americas, Australia and Antarctica).
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