Cetina- spring - hydrogeological nature monument

The site of Vrela Cetine, the spring of the Cetina River, covers an area of 29.81 ha and was protected in 1971.This site contains a series of karst springs. The three main springs, Veliko vrilo, Vukovića vrilo and Batića vrilo, lie along the edge of the Paško polje or Pag Field, in the foothills of the Dinara mountain range. All the springs were formed at the site of contact of permeable marl in the field and water impermeable limestone of the surrounding plateaus.

The springs draw attention with their magnificent clarity and blue-green colour. Veliko vrilo, also called the Glavaš spring, is a submerged speleological structure, which divers have investigated to a depth of 150 m.

Near the springs is the oldest Early Croatian church in Croatia, the Church of the Holy Salvation (Sv. Spas). The church belongs to the pre-Romanesque style with a bell tower, and was erected in the 9th century. Next to the church is a cemetery with tombs (traditional stone headstones) dating back to the 14th and 15th centuries.

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Stara straža geological nature monument

The Stara straža site, covering an area of 1.17 ha, was protected in 1961. The site is several kilometers from Knin on the road to Gračac. The site is particularly interesting due to the lovely visible wave in the rock, about 15 m wide and 5 m high, representing the waving bending of layers of the Earth's core.
The layers were bent (wrinkled) under the influence of lateral pressures following the movement of the rock mass. Layers of Jurassic and Cretaceous age are developed, and composed of alternating limestone and dolomite rock, with zones of thin, grey marly limestone and hornstone. In the malmy layers of rock, the coral Cladocoropsis is easily visible.

This site is important for its characteristic profiles, i.e. paleontological, mineralogical, petrographical and sedimentological. The profile is interesting as an area for teaching geology concepts, such as the basic structural elements of rock like layering, wrinkles and faults.