12. NAGYVISNYÓ, MIHALOVITS QUARRY

The Mihalovits quarry located at the end of József Attila St. in the villages of Nagyvisnyó reveals the black, bituminous Nagyvisnyó Limestone Formation, which formed 260-252 million years ago during the Late Permian period.

The formation consists of thin-bedded black limestone, with marl and calcareous marl between the limestone beds. Based on the dip of the layers, the quarry was established in the core of a downward-sloping layer sequence.

The rock is extremely rich in fossils. The remains of extinct animals accumulated in a highly oxygen-deficient environment and have been preserved in almost perfect condition. Typical fossils include calcareous algae, foraminifera, shells, ostracods, and bivalves.

The quarry is a protected geological key section. It is open to the public.