The tower of Ola is orientated south-east and its exterior presents twelve rows of granite blocks and another thirteen in trachyte, producing a singular chiaroscuro chromatic effect. At the base it is 12.70 m in diameter and is preserved to a height of 10.70 m. The interior is constituted by an entrance with architrave, a corridor, a guardroom to the right, a stairway to the left and a circular chamber with three large cruciform niches. The area south of the nuraghe is occupied by four small circular structures, built with medium sized stones wedged with gravel and arranged in double rows to a height of just over 50 cm. The largest hut, diameter 4.5 m, housed a small ‘cupboard’ made of vertically placed shale slabs (width 1.20 m, height 0.60 m, depth 1.10 m).

The tholos deposit, 2.20 m deep, had been disturbed by illegal excavations and animal dens. However, it was rich in finds, almost all pottery, of nuragic, Punic and Roman date. The huts produced only a few fragments of undecorated nurgic pottery.

The nuragic pottery assemblage included open forms, such as carinated hemispherical bowls and dishes with inverted rims and casseroles and closed forms such as ovoid jars with handles, pitchers with enlarged rims and X-shaped handles, cooking pots with lug-handles and basins with flanged rims decorated with large impressed dots, and a few askos fragments. A typology was published in 2003. The most important finds were casseroles decorated with combed and pricked geometric motifs, a type of pottery with a slate-grey surface and vases decorated with dots and small impressed circles encrusted with white.

The site’s occupation phases date from the Recent Bronze Age until the early Iron Age. The Punic and Roman pottery attests moments of later use.