Tisza unit is a tectonic block, microplate. The two major crustal blocks of the Pannonian Basin

Pannonian Basin

The Pannonian Basin or Carpathian Basin is a large basin in East-Central Europe.The geomorphological term Pannonian Plain is more widely used for roughly the same region though with a somewhat different sense - meaning only the lowlands, the plain that remained when the Pliocene Pannonian Sea dried...

, Pelso and Tisza, underwent a complex process of rotation and extension of variable magnitude during the Tertiary. The northward push of the Adriatic Block initiated the eastward displacement and rotation of both the Alcapa (or Pelso) and Tisza blocks. The Zágráb-Hernád line is the former plate margin between the Pelso of African origin and the Tisza Plate of Eurasian origin.