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New archaeomagnetic results from three archaeological kilns recovered from one archaeological site in north-east Spain are reported. The abandonment of kilns BC1 and BC2 has been dated by archaeological evidence to between ad 0 and ad 50, whereas kiln BC3 was abandoned later, between ad 50 and ad 150. Mean archaeomagnetic directions and archaeointensities have been obtained from classical Thellier experiments. The new data are consistent with previous archaeomagnetic data for the Iberian Peninsula. They add to and improve the description of palaeosecular variation during Roman times in Iberia. [ABSTRACT FROM AUTHOR]

In directional archaeomagnetic studies, it is rarely analysed whether the combustion structures display anisotropy of their thermoremanent magnetization (ATRM). It has been observed that, in specific cases like thin baked clays from the base of small hearths, archaeomagnetic directions can also be disturbed by the ATRM. We re-examine data from 56 combustion structures from Iberia and use them to analyse the ATRM effect on their archaeomagnetic directions. Flattening of inclinations up to 13o has been found in highly anisotropic structures that can be adequately corrected by the ATRM tensors. We show how the lack of anisotropy corrections on directional values can dramatically deteriorate the ages obtained from archaeomagnetic dating, highlighting the importance of systematically analysing this property in future archaeomagnetic studies. [Display omitted] • Inclination flattening has been found on archaeomagnetic directional studies. • Thin baked clays from small hearths are prone to present flatten inclinations. • These combustion structures present high anisotropy of their thermorremanence. • Anisotropy of thermoremanence tensors correct deviations of the inclinations. [ABSTRACT FROM AUTHOR]