Sedimentation cycles in the Neogene grabens along the Struma valley

Three sеdimentation cycles have been differential din the Neogene grabens along the valley of the Struma river, correlated and dated after the relations between the sediments and after Mammals finds. I cycle (Middle Miocene – Vallesian) – only in Sandanshi Graben, active faults with fanglomerates –Petrovo and southern part of the West-Pirin faults. II cycle (Maeotian = Lower-Middle Turolian) – in Sandanski, Strumešnica, Simitli and Blagoevgrad Grabens, active faults with fanglomeratcs – Podgorie, Petrovo, Krupnik and West-Rila faults. Ill cycle (Pontian = Middle-Upper Turolian and probably also Lower Pliocene) – in Sandanki, Strumešnica, Oštava, Simitli and Blagoevgrad Grabens, active faults with fanglomeratcs – Podgorie, Melnik, West-Pirin and west Rila faults. After the third cycle (probably in Eopleistocne) the uplifting of the western horsts and the intensive faulting have formed block with a monoclinal dip of the Neogene beds toward the East, opposite to the facies zonality. The Podgorie, Petrovo, West-Pirin, Krupnik and West Rila faults were also reactivated.