Abstract
Geophysical survey methods are broadly used to delimit and characterize archaeological sites, but the archaeological interpretation of geophysical data remains one of the challenges. Indeed, many scenarios can generate a similar geophysical response, and often interpretations can not be validated without access to the subsoil. In large geophysical surveys many anomalies are detected and validation through archaeological trenches can not be afforded. This paper analyses the validity of geoarchaeological core survey to check the archaeological interpretations based on geophysical results. The Roman site located at Auritz/Burguete and Aurizberri/Espinal (Navarre), provides a great case of study as many investigations have been carried out. After the gradiometer survey performed in 2013 a sediment core survey was designed. 132 cores were drilled using a hand-held coring machine and the sediments were analysed in situ. Site delimitation and archaeological interpretations based on magnetic data could be improved or corrected. In this regard, the core survey proved to be an useful methodology as many anomalies could be checked within reasonable time and resources. However, further geophysical investigations trough GPR revealed unexpected remains in areas where no archaeological deposits were identified through coring. Excavations showed poor conservation level in some of those areas, leading to thin archaeological deposits hard to identify at the cores. The sediment core survey, therefore, was proved to be inconclusive to delimit the archaeological site.
Highlights
Geophysical prospection has proved to be a useful tool in helping archaeologists improving their knowledge of archaeological sites
Some studies combine the use of geoarchaeological and geophysical investigations, but relative few studies have described the use of core sampling to target geophysical anomalies and validate the archaeological interpretation based on geophysical data (e.g., [17,18])
This paper provides an example from a Roman site, where a sediment core sampling was used to target geophysical anomalies and validate the archaeological interpretation
Summary
Geophysical prospection has proved to be a useful tool in helping archaeologists improving their knowledge of archaeological sites. In last decades, their use has notably grown and specialized literature has been developped (e.g., [1,2,3,4,5]). The validation through excavation would be the best option in order to check the interpretations. It is not always possible, in commercial projects, or only a small fraction of the surveyed area can be excavated. This paper analyzes the validity of geoarchaeological survey to check the archaeological interpretations based on geophysical results, as an extension of a previous contribution [12]
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