| Περίληψη: | In this diploma thesis, the analysis of the stratigraphic structure of the Mesozoic in the syncline of Arta, with emphasis on the Senonian limestones was carried out. The study area consists of nine (9) sections with a NNE-SSW direction along the new Ionian road from the village of Kambi as far as Ammotopos, a quarry located to the west of the Ionian road and the road connecting the plain with the village of Gribovo to the east, at Xerovouni Mountain, and geotectonically belongs to Central Ionian Zone. Studied outcrops cross cut the major thrust between the Central and the External Ionian Zone and the prospect was the study of the deformation close and far from the thrust. Results have emerged from work in the field as well as from microfacies analysis.
The field-work includes a detailed description of the lithology of the sections and their characteristics as well as the recording of the faults. The intense internal deformation recorded in most of the sections is synchronous to the sedimentation and is owed to the thrust activity. The general dip direction of the deformation is to the SW. A strike slip fault brings the Vigla’s limestones into lateral contact with the Senonian limestones.
From the studied area seventeen (17) samples were collected, and microfacies analysis was carried out, using polarizing microscope in order to identify fossil assemblages and age determination. Four (4) facies zones (FZ 1, 2, 3 & 4) were identified in the same region, i.e. the coexistence of 4 different environments. The above different facies are due to the fault activity that brings into lateral contact different environments. It seems that stratigraphically the environment changes from shallow waters to deep-sea basin, during the sedimentation. Age determination showed that some of the sections have a different age from the ages that the geological map indicates. Especially, for sections 7 and 8, the geological maps states that their age is Late Cretaceous, but our results showed a Lower Cretaceous age. Based on our data, we propose changes in the geological map of I.G.M.E. as well as an additional study of the area.
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