When the roteiros of ecological tourism of the Rio Grande do Norte start to b e opened in the ways that lead to the sertão of Angicos for Jucurutu, Campo Grande, São Rafael and Santana do Matos, they will pass in the plain that precedes the bulk of the Serra de Santana. This is the Lágea Formosa, a granite formation, where the predominant colors are the white and grey, with more than 300 meters of altitude, an area around 1,5 km long by about 300 meters wide.

Hiding secrets and mysteries it still is kept almost virgin, with its flora and preserved faunas, thanks to the devotion of its owners, who have a love and zeal for all the area involved. In the form of a year-old calf lying down, it presents a steep side, where the access is a great and dangerous adventure. By the head and the tail of the young calf, it has accessible ways. The best part that one sees when scaling the lágea is the view, where you see the waters of the reservoir Armando Ribeiro Gonçalves, the river Açu, the peak of the Cabugi and the Serra de Santana, and beyond the cities of São Rafael and Santana do Matos.

Close by had been sites of shelter for prehistoric animals, according to researchers of the Institute of Anthropology of the UFRN. It had also served for housing of our own ancestors. It has registered rupestres (old Indian paintings) on some rocks, situated near the base of the lágea. There are impressions of the mark of hands, whose finger tips are to a height of 2,5 meters above of the ground. In some, the marks of the fingers are drawn out, covering the rock for more than fifteen centimeters.

The lágea is inhabited by animals such as foxes, pebas, armadillos, tejuaçús, tamanduás, mocó and preás, as well as snakes, insects and small birds. Hunting is forbidden, but it has not always been respected, especially during the night. Fruitful trees include the pitombeira and the pinheira.

Strange bones of giant animals have been appearing in the rocks next to the Lágea Formosa, when agriculturists worked, as was the custom, withdrawing the natural sediment that sanded cacimbas and tanks that accumulate rain water. The fact attracted the attention and the curiosity of the owner of the farm and the news if it spread, resulting that the professors of the Museum of Anthropology Cascudo Chamber came there for identification of the findings. According to geologist and ecologist Eduardo Bagnoli, "these tanks that had formed in the granite lajedos of the region are millions of years old, defined through processes known biochemists as 'carbon dating', and served to accumulate drinking waters in the rainy seasons".

Since early pre-history until the present, such animals, as well as the first human beings to ramble the region - supposedly at least 10,000 years ago - made use of these natural resources to guarantee their survival. Among these animals, other than known giant mammals such as the "mega fauna of the Pleistocene", that had appeared on the planet in the "vacuum" left by the extinguishing of the dinosaurs, occurred some 65 million years ago. According to Bagnoli, these animals had been particularly abundant in the Brazilian Northeast and among them included the mastodons, giant preguiças and armadillos and the celebrated saber-tooth tiger.

Arriving mainly during the dry periods, these animals were obliged to frequent the tanks to use as their base. As well as happens today in Africa, when arriving in the tanks there, there are found the great carnivores in concealment, waiting the best moment to attack. After these bloody meetings resulted in an infinity of destroyed carcasses that went to rest in the deep part of one of the tanks, where, after the years, mineralized, changing themselves into fossils, that had later been found by the farmers of the region. A good part of these bones can today be seen in the Museum Câmaras Cascudos, that also one shows one dinosaur (2º floor) with a reconstitution of the landscape of the Fazenda Lágea Formosa at the time that the great mammals had walked there.

Eduardo Bagnoli was for the first time in the region, in 1986, participating in an excavation. In 1988 he wrote an article, which called attention to the pressing necessity of preserving this cultural patrimony