Pannonian Basin
The Požega Valley is entirely located in the Pannonian Basin, one of three major geomorphological parts of Croatia. The Pannonian Basin took shape through Miocenian thinning and the subsidence of crust structures formed during Late Paleozoic Variscan orogeny. The Paleozoic and Mesozoic structures are visible in the mountains and hills surrounding the valley. The processes also led to the formation of a stratovolcanic chain in the basin 17 – 12 Mya (million years ago) and intensified subsidence observed until 5 Mya as well as flood basalts about 7.5 Mya.