Spatial mapping using electromagnetic (EM) conductivity can quickly define past sedimentary environments within meandering river floodplain settings and, most important, those most likely to include archaeological materials. Natural levee and uplifted fluvial terrace environments would have been the most likely areas for people to place permanent settlements, as these topographically high areaswould have remained dry during most annual floods.The spatialpatterning of high andlow electrical conductivity regions, when combined with geological core and auger information, can define a number of depositional environments in floodplains including channels, point bars, natural levees and oxbow lakes.Conductivity maps can then be used to predict the locations of prehistoric floodplain environments, and therefore the most likely locations for archaeological remains. Suitable areas can then be further tested for archaeological features using detailed geophysical surveys and other archaeological survey methods. Case studies are presented from California,Texas and Mississippi that integrate these methods fordepositionalenvironment mapping as awayofaccessing the archaeological potential in meandering river floodplains.

Ground-Penetrating Radar (GPR) data that are frequency filtered will produce a variety of data sets, eachwitha differingsubsurfaceresolution.At the site of Petra,Jordan, filteredreflection datawereprocessed to produce discrete categories of low (200^350 MHz), middle (500^650 MHz), and high (6508 00 MHz) frequency wave amplitudes. The high frequency reflections were especially effective in identifying construction techniques from a buried Nabataean age wall.The results suggest that postacquisition GPR data frequency filtering may behelpfulin identifying some differencesin construction techniques and building materials in otherwise difficult to interpret subtle buried features.