In the Neolithic period, with the introduction of agriculture, a change was found in eating habits, increased cereal consumption and decreased meat consumption, which created the need to ingest a salt supplement that was obtained through its direct consumption or through salty foods.

In prehistoric times man used the salt that was formed in natural cavities of rocks in the days of greater heat, but with the demographic increase that was felt, especially during the Iron Age, they had to discover strategies and methods that addressed the needs of the population.

In a way of imitating nature, Man dug in the rocks, potholes that allowed an efficient evaporation of the water so that with some speed the most important resource was produced.

The potholes were dug into the rock through a chipping process. Its size is variable, since the available surfaces in the rocks are used. There is also no rule regarding its shape, and the potholes can assume a sub-rectangular, trapezoidal or even semicircular shape. Regarding to depth, these were designed to contain a minimum amount of water that would allow easy and rapid evaporation, estimated to be around 5 to 10 cm. As for the location, the salt flats would be above the high tide line, preventing it from flooding when it reached the maximum level. This fact leads to see that the mode of operation, consisted of an indirect flood system, according to which salt explorers would flood the potholes with water that they transported from the sea.

In this Natural Monument there are salt pans, pre-Roman, dug in granite rocks.