Most interesting geological features of Goričko are most certainly spring of mineral water in Nuskova and deposits of basaltic tuffs and pyroclasstic materals in abandoned rock mines in Grad. Both are categorised as important natural values of national interest. Among other important geological and geomorphical natural values the area of Sotinski breg and Slatinska graba are included.
The area of Sotinski breg is the highest point of Prekmurje and build up from paleozoic methamorphic schists, which are old up to 500 milion of years old and created deep in the earth crust under imense pressure and temperature. These rocks are today exploited in rock mine as technical rock for road gravel. On the hill of Sotinski breg the biggest European owls - Eurasian eagle owls (bubo bubo) are nesting. With a little luck we can hear it in the dark.
Mineral spring in Nuskova
Mineral spring in Nuskova is the natural source of mineral water. The cooling magma deep in the Earth crust relases a big amount of gasses (CO2 and others), which then rise up through the faults and dissolve in waters layers. These gases together with water form weak acids. These acids then help by dissolving minerals and other elements, which are present in the water when it springs on the surface. Mineral water in Nuskova contains bigger amounts of iron, which can be seen in the red color (iron oxides) of nearby spring. This water is commonly used by locals and has special taste.
Grad - deposits of basaltic tuff and pyroclastites
On the northern part of Grad village there is abandoned rock mine of basaltic tuffs and pyroclastites. These deposits are evidence of pliocenic vulcanic activity before three milions years. Basaltic tuff is sedimentary rock which was created by compaction of vulcanic ashes and sands. Within tuffs we can find also some pyroclastites. Most common are olivine nodules in small, oval form. In these nodules are small crystalls of mineral olivine. On air these nodules get weathered fast. These deposits are the only known source of olivine nodules known in Slovenia.