Magnetic And Gpr Survey To Identify Archaeological Features On Cacoal Site, Anajás River, Marajó Island, Pará, Brazil

Two geophysical survey techniques, magnetometry and ground-penetrating radar (GPR) were used at the Cacoal<br>archaeological site, in Marajó Island. Analysis of geophysical data shows that magnetometry produced good results,<br>while GPR was less satisfactory, producing efficient results only in conjunction with magnetic data. These data were very<br>helpful for choosing optimal areas for excavation, leading to the identification of subsurface remains (sherd<br>concentrations and buried vessels) in areas of geophysical anomalies.