 The analyzed furnaces and Carbon-14 testing indicate that the site has intermittently been occupied for at least 7,800 years or more.Archaeologists Moisés Valadez, Solveig A. Turpin and Herbert H. Eling propose for the Boca de Potrerillos portable art two styles, designating them by the name of the place they were found.Stones from Loma de San Pedro.