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Near Holzhausen in the District of Oldenburg, geomagnetic anomalies were detected by geomagnetic surveys. In view of the size and the concentric shape that emerged from the anomalies, the resulting structure was interpreted as an enclosure. To confirm this assumption, an archaeological excavation was carried out in 2010 and 2011. Due to the fact that the anomalies and the structure could not be satisfactorily explained by this, additional pedological and geological investigations were conducted. The result that the anomalies were generated by geological structures shows that the interpretation of geomagnetic measurements – in spite of good analogies – is limited without further field investigations.