Despite the small area of 2,58ha, it has very interesting and complicated geological structure. The protected subject is a zone of contacts of vulcanites with sedimentary rocks of Triassic and Cretaceous periods. It was created for reason of preservation regarding didactic and scientific aims, rare profiles and biological phenomenon. "Nefelinity"[pl.] are mostly located in the western deepest pit, and in the northern wall of the quarry. Among numerous forms of hydrotermal transformations, there is worth noticing a big glass of jasper in area of "karchowicka" form, nearby a contact with "nefelinit"[pl.]. In the reach of vulcanites, there are numerous blocks of sand and sandstones of cenomanian, limestone [marglisty(pl.)-of marlstone] of Turonian.