 Towards the Northwest of Sonora in the basins of the rivers Magdalena, Concepción, Imuris, altar and Cucurpe, there are trinchera culture communities, whose villages with hole houses became more numerous after 700 AD.Sonora has numerous sites with engraved or painted rock designs, the best known are “La Proveedora” in the trinchera tradition region and “La Pintada”, in the Central Coast area.There are many animal shapes, mainly Pronghorn and bighorn sheep (typical of the region), almost always in herds and sometimes depicting pregnant bellies.