Prehistory in the Sulcis area, and in Sardinia in general, gained a new chapter in 2012. The first traces of the presence of humans have always been attributed to the ancient Neolithic period (approximately the 6th millennium BC), while, in reality, a finding in the site of Su Carroppu on the limestone hills of Sirri, an agricultural ad pastoral district of Carbonia, moves the date to three thousand years earlier. The period in which humans frequented the shelter under the rocks in this part of the Sulcis area dates back to the Mesolithic era: bones were found here and radiocarbon dating places them at 9000 BC, representing scientific proof, after endless unconfirmed suppositions, of the new dating of prehistoric Sardinia.