Ivan S. Zagorèev writes: The problem of the Late Cenozoic extension in the Northern Aegean has been discussed for more than 30 years. The approach by Sokoutis et al. 1993 and by Dinter & Royden (1993) seeks the control of this extension in the displacements along very low-angle normal faults of great extent and offset (detachments) which resulted also in a fast unroofing of deep crustal levels in the footwall, and intense sediment deposition on the downthrown side (i.e., formation of depocentres). This problem is traditionally discussed without taking into account the abundant evidence from the adjacent to the north, and well-exposed and mapped Central-Balkan neotectonic region (Zagorèev 1992b).

The following important facets of this problem should be taken into consideration.

(1) Age of the faulting event, and identification of fault movements of a given age. The region is characterized by several Alpine phases of thrusting proven with fossildocumented sediments within the following limits: (i) Berriasian (Aptian?)—Turonian (Cenomanian?); (ii) Campanian (Maastrichtian?)—Late Eocene (Palaeocene?); (iii) Mid-Eocene—Late Eocene; (iv) Mid-Oligocene (?); (v) earliest Miocene—Badenian. Normal faulting is proven (again with fossiliferous sediments) in the following times: (i) Late Triassic (Carnian—Rhaetian); (ii) Early Jurassic (Hettangian—Pliensbachian); (iii) Bathonian; (iv) Callovian; (v) Tithonian—Berriasian; (vi), Cenomanian— Turonian; (vii) Coniacian—Campanian; (Viii) Maastrichtian; (ix) Palaeocene—Early Eocene; (X) Late Eocene; (xi) Mid-Oligocene—Early Miocene; (xii) Late Badenian—Maeotian; (xiii) Pontian—Romanian; (xiv) Pleistocene— Holocene (e.g. Boyanov et al. 1989; Zagorèev 1992a, b). Experience in southwest Bulgaria shows that some fault

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