The geological sketch presented in this article is a preliminary cartographical interpretation of nume-rous data found in the literature.· It results from this that the structural area of the Middle Baltic Sea is bipartite. The typical platform part in the east is characterized by a feeble Variscan reconstruction. The near-platform area, situated west of Bornholm, distinguishes itself by Laramie structure, with a NW-sE direction. In the deeper basement a swell
runs from North Rilgen towards Koszalin, in a WNW - ESE direction. The swell separates the southern stable area of block-fold structure from the northern one characterized by type block structure. This swell ends the Middle-Polish anticlinorium.
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