The Upper Tisa Valley. Preparatory proposal for Ramsay

Figure 2 A schematic geological map of the area between River Black Tisa and River
Tereblia. After Szalai T.
Legend: 1 Mediterranean 2 Middle Oligocene 3 Lower Oligocene (shale) 4 Upper Eocene (claymarl)
5 Eocene (MAGURA belt) 6 Upper Cretaceous, Lower Eocene (clay) 7 Upper Cretaceous,
Lower Eocene (sandstone) 8 Upper Cretaceous, Lower Eocene (shale) 9 Cretaceous, Eocene 10
Cliffs 11 Triassic 12 Mica schist, gneiss 13 Aereated springs 14 Salt springs 15 Tectonic
window 16 Overthrustings 17 Segments
The high mountains here are crystalline masses emerging in isolation from the
significantly folded Permian-Mesozoic strata. They were probably already parts of the
structure of the former Variscian mountains. The Mesozoic strata - together with their
shell that today encloses them in a common frame - were involved in the Cretaceous
folding, but their present mountainous character is still partly due to the faults that
took place in the Tertiary (Figure 2).
In our homeland only few of the 'Tisia'-massif ancient mountain range have
stayed on the surface. At other locations the Tisia sank so deep that it has been covered
by thick Tertiary formations. The volcanic mountains also belong to Tertiary
formations. They are traces left by lava eruptions from the tectonic rift of the western
foothills of the sandstone mountain ranges and the fissure marking the subsidence of
the Plain (Figure 3).
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