An Updated Paleosecular Variation Curve from Mesoamerica for Last Two Millennia

Early efforts for establishing an archeomagnetic reference curve for Mesoamerica failed due to the absence of reliable radiometric dates. Recently, numerous 14C data become available from Central Mexico (Teopancazco and Xalla in Teotihuacan area, Xochicalco, Templo Mayor, Tlatelolco, Cholula and Cacaxtla). In light of these new radiometric and magnetic information, we present here an updated secular variation curve for the last two millennia. In addition, a comparative analysis were carried out with southwest North American data (Lengylel and Eighmy , 2001).