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Bulgarie ; Ere secondaire ; Faille ; Géographie de l'Europe ; Géomorphologie structurale ; Relief de faille ; Sipka, région ; Stara planina
(supprimer)
between the core and the mantle of the anticline. It is of comparatively old age. To the west of it, the calcareous Middle and Upper Triastic is of wider occurence. Tithonian and Valanginian occur only to the west of this set, and Turonian only to the east