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Comparative stratigraphic table between the formations of Pechelbronn (North URG) and the Potash Basins and Mulhouse/Sundgau horst (South URG). The Marnes à Cyrènes and the topmost part of the Couches à Mélettes (Upper Rupelian) are lacking in the GRT wells. The Calcaire à Planorbes (Lutetian) is lateraly discontinuous and was not intercepted by the wells of Rittershoffen.
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