Abstract
А transition from the classical Jurassic Balkanide development towards the predominantly terrigenous sedimentation pattern of the Treklyano zone is observed in the Коnуаvа Mountain. Most of the sections begin with the sandstones of the Gradets Formation (Toarcian – Aalenian Stage) followed bу the Polaten Formation (shallow marine limestones; Aalenian - middle parts of the Bathonian Stage), Momchil Formation (shales and marls with limestone interbeds; uррег parts of the Bathonian Stage – Oxfordian Stage), and the flysch Kostel Formation (Upper Jurassic). Some parts of the Kostel Formation are characterized here by а shallow-water marine sedimentation. In the north-eastern parts of the Коnуаvа Mountain, а lateral transition towards the Svetlya Jurassic graben has been observed, and the Momchil and parts of the Kostel Formation are laterally replaced by the carbonate breccia and conglomerate of the Lobosh Formation (Callovian - parts of the Кimmeridgian Stage).
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