Southern Mexico represents another area in which Amber was known from ancient age. In fact in the past, Mexican Amber was worn by Aztechi and it was mentioned for the first time into some missionary writings, who visited those lands before the Spanish conquest. The layers are located into the most southern part of Mexico, into the Chiapas area, close to Guatemala, where it is possible to find out a fossil resin who dates back to about 22-26 milion years ago. Thanks to a carefull analysis about fossil fauna and flora into the Dominican and Mexican Amber, it has been possible to effect the environment rebuilding of the ancient tropical rainforests. Through these studies it results that this Amber dates back to the Tertiary Period, which follows the dinosaur's extinction.