The Hellenic Internal Units of Grammos area (Northern Greece): preliminary data.

The closure of the Jurassic Tethys oceanic basin is do- cumented by the Dinaric-Hellenic ophiolite belt that cro- ps out for a long distance from Serbian-Bosnian area to Greece. Ophiolite rocks from the Grammos Massif in northwestern Greece (fig. 1) record a Mesozoic history of subduction, accretion and obduction deformation. Pre- vious work focused on the Albanian (Mirdita and Korcia) and Hellenic (Pindos-Vourinos, Koziakas, Orthys and Argolis) ophiolites located, respectively, to the north and to the south of Grammos Massif. The Grammos Massif represents a key area to connect the tectonic evolution of the Dinaric-Hellenic ophiolites. The complex history of this area is recorded in three main tectonic units derived both from oceanic and continental domains: Ophiolitic Nappe, Sub-ophiolitic Mélange and the Pindos Flysch Unit. Above the Ophiolitic Nappe and the Sub-ophioli- tic Mélange a thick post-orogenic carbonate sequence (Lower-Upper Cretaceous) is present (fig. 2, fig. 3a). Moreover in this area the westward thrusts of these units has been unconformably covered by the Tertiary molasses of the Mesohellenic Basin.