The relationship between the geotectonic zones of the Hellenides orogen is important for understanding its geological evolution. The Parnassus-Ghiona geotectonic zone in central Greece has long been interpreted as thrust over the Vardoussia subzone. On the basis of detailed geological mapping, supported by a stratigraphic study and tectonic observations, no evidence of an overthrust of the Ghiona limestones on the Vardoussia flysch was found.The new data show that the transition of the Ghiona limestones to the Vardoussia flysch is a sedimentary passage and at certain places the base of the flysch is marked by a basal conglomerate formation. The entire deformation of the Ghiona is related to a large-scale anticline of the limestone series, presenting a highly inclined western limb, overlain by the flysch strata, which were deposited in a common basin between Ghiona and Vardoussia mountains. Consequently, questions concerning the geotectonic position of the Vardoussia subzone and the role of the Parnassus-Ghiona zone to the orogenic evolution of the eastern External Hellenides are raised.

Le cadre stratigraphique et structural du bassin de Kalamos-Malakassa est le résultat d'intenses mouvements verticaux dès le Miocène inférieur suivis par un soulèvement de sa partie Sud. Nous avons pu distinguer les séries suivantes : Les séries de Kalamos-Malakassa et de Schimatari, qui sont les membres inférieurs du bassin néogène. Il s'agit des dépôts lacustres contenant des couches ligniteuses. Les séries de Chalkoutsi-Dilessi et d'Oropos, sont le passage latéral des formations de Schimatari et de Kalamos-Malakassa respectivement. Ces formations sont affectées des phases tectoniques suivantes : -une première phase extensive -une phase compressive orientée environ NE-SW -une phase distensive d'âge pliocène à direction d'extension NE-SW. -une phase distensive d ' âge quaternaire à direction d 'allongement N-S .

The study of the sedimentological and mineralogical characteristics of the coastal sediments in the Loutraki gulf, included analyses of a large number of samples, that is granulometry, thin section study and x-ray examination. From these data the granulometry paramètres were assessed such as mean grain size, standard deviation σ, skewness SK, and kurtosis KG of the sediments. The study of the sedimentological parameters based on the mean grain size the offshoreline is covered by coarse grain sand, whereas the tidal zone indicates a high energy environment. The longshoredrift is from Ν to S. Most of the sand is loosely graded in the nearschore area, medium graded in the foreshore area and well graded in the backshore area. Their constant declination indicates a trend for a better gradation of sediments southwards. The latter combined with the mean grain size indicate a reduction of kinetic energy from Ν to S. In addition, the beachrocks, were studied together with their, elevation and their mineral composition .