Here we address the latter by using a set of storage jar handles (fired clay) stamped by royal seals as part of the ancient administrative system in Judah (Jerusalem and its vicinity).The typology of the stamp impressions, which corresponds to changes in the political entities ruling this area, provides excellent age constraints for the firing event of these artifacts.It is located in the Institute of Earth Sciences "Jaume Almera", a building property of the CSIC in the University Area.It collaborates with numerous national research groups from the Universities of Barcelona, Autònoma de Barcelona, Zaragoza, Autónoma de Madrid, Complutense de Madrid, Granada, Madrid, Euskadi, Salamanca, Tarragona or Valencia, several research groups of the CSIC: CMIMA, IDAEA, Instituto Andaluz de Ciencias de la Tierra, National Museum of Natural Sciences, Institute of Natural products, researchers from the IGME or the Institute of Paleontology of Sabadell, and international researchers from the Universities of Utrecht, Geneve, Instituto Antártico Argentino, Coimbra, Michigan or Leoben.In addition, the study provides further evidence of extremely strong field in the late eighth century BCE (“geomagnetic spike”), and of rapid rates of change (20% over three decades).The improved Levantine record is an important basis for geophysical models (core−mantle interactions, cosmogenic processes, and more) as well as a reference for archaeomagnetic dating. His graduate studies focused on the geology of the Great Basin of the western United States as revealed by the geochronology, chemistry, and paleomagnetism of gigantic ash flow eruptions that blanketed the area between 20 and 35 million years ago. in Chemistry and Geology in 1975 from the University of California, Davis and his Ph. in Geology from the University of California, Berkeley in 1985.
Its special significance is that with a small sample (10g) it can be applied to material up to 100,000 years old, i.e. ancillary sample: any non-artifactual materials collected by archaeologists to aid in dating, paleoenvironmental reconstruction, or other interpretations - e.g.it is based on the fact that changes in the earth's magnetic field over time can be recorded as remnant magnetism in materials such as baked clay structure (ovens, kilns, and hearths).archaeozoology: sometimes referred to as zooarchaeology, this involves the identification and analysis of faunal species from archaeological sites, as an aid to the reconstruction of human diets and to an understanding of the contemporary environment at the time of deposition.Together with rigorous paleomagnetic experimental procedures, this study yielded an unparalleled record of the geomagnetic field intensity during the eighth to second centuries BCE.The new record constitutes a substantial advance in our knowledge of past geomagnetic field variations in the southern Levant.