Trešnjevica―convenienty located on the road towards Voćin―is a stunning place to experience Papuk's unique geology. You'll be able to find volcanic rocks like 'rhyolite', 'andesite', basalt or tuff, alongside some that cooled deep underground: granite and 'pegmatite'. A unique mix! Metamorphic rocks ('gneiss'/'migmatite') show that intense heat and pressure reshaped older rocks over time, and it has been cut in half by layers of volcanic basalt; offering evidence of volcanic activity in this region. So there is a timespan of hundreds of millions of years, from the Paleozoic to Tertiary periods. It's a window to the past, essentially.
Part of: Geosites in Papuk