Geological Map of Chelmos-Vouraikos Geopark: HERE

Panachaiko Mountain Range

Geologically, it belongs to the Olonos - Pindos geotectonic Unit and consists mainly of flysch deposits, sandy and rarely marly layers, thin plated pelagic limestones, yellow, red and green radiolarites with frequent intercalations of silicate and brown clays (Maastrichtian–Palaeocene). The northern and southeastern slopes of Panachaiko Mountain in N. Peloponnese are covered by Plio- Pleistocene lacustrine, marine / lagoonal and riverine sediments with marls, clays, coarse grained sands, fine sandstones and conglomerates.


Erymanthos Mountain Range

Geotectonically, Erymanthos belongs to the Olonos-Pindos Unit, except for a part on its west side which belongs to the Gavrovo-Tripolis Unit. Olonos-Pindos Unit includes flysch deposits with alternations of sandstones and thick sandy siltstones (Eocene), transitional platy limestone beds, limy-marls, sandstones and brecciated limestones (Maastrichtian-Palaeocene), platy limestones (Senonian), red siltstones and the 'First Flysch' (Cretaceous), Kastelli siltstones and radiolarites (Jurasic), Drymos limestones (Upper Triadic) and the Priolithos clastic series of siltstones and sandstones (Karnio). Gavrovo-Tripolis Unit includes irregular alternations of fine sandstones and green siltstones and conglomerate lenses with limestone pebbles (Upper Eocene-Oligocene), transitional beds to flysch with bioclastic limestones (Lutetian - Priabonian) and finally, an reversed limestone series within the valley of Alepochori (Palaeocene).


Barbas and Klokos Mountain Range

The mountain rangef of Barbas and Klokos geologically belongs to Olonos-Pindos Unit. Platy limestones of light grey, ash and purple colour (Upper Cretaceous) and radiolarites with alternations of red, green mudstones and cherts (Upper Jurassic-Lower Cretaceous) are found there. Near the radiolarites flysch with the alternation of sandstone and marly layers (Palaeocene - Eocene) are often found. Finally, at Klokos, solid conglomerate beds with intercalationss of mud layers (Pliocene).


Killini (or Ziria) Mountain Range

In the mountainous massif of Kyllini (or Ziria) outcrops of Olonos - Pindos and Gavrovo - Tripolis Unit rocks, as well as the metamorphic series of Zarouchla (Phyllite-Quartzite unit) and the volcanic rocks at its west and south part of indeterminable age. The formation of Goura consists of alternations of blue-black limestones and dark limestones. Volcanic rocks, mainly in the southern part, are prasinites, alternating with black schist. A large area towards the core of the mountain range is covered by the red or white coloured platy limestones of Olonos- Pindos Unit (Coniacian Maastrichtian). North and east there are conglomerates (Pliocene). Remarkable is the appearance of 1 km to 100 meters boulders deriving from the rocks of the two units, as well as from the volcanic rocks. The unit of Tripolis is characterized by the appearance of black or grey limestones (Kemonian) and limestones - dolomites (Upper Triadic - Lower Cretaceous).


Chelmos Mountain Range

In the mountainous range of Chelmos, as in Erymanthos and Ziria, we observe rocks of both units, namely the Olonos - Pindos and the Gavrovo-Tripolis geotectonic units. The Gavrovo-Tripolis unit is mainly developed in the form of a tectonic window and consists of flysch deposits with irregular alternations of sandstone and green siltstone beds (Eocene), transitional beds to flysch with bioclastic limestones and conglomerates. White dolomites and thick limestones (Cretaceous) follow. As a substrate to this unit, themetamorphic rocks of the Phyllite-Quartzite unit are found. The Olonos-Pindos unit includes also flysch deposits with sandstones, sandy siltstones (Eocene), thin bedded limestones (Maastricht) and radiolarites (Jurasic).