1. ZAMG, 1190 Vienna, Austria. E-mail: patrick.arneitz@zamg.ac.at
2. Palaeomagnetic Laboratory Gams, 8130 Frohnleiten, Austria
3. Geological and Geophysical Institute of Hungary, 8237 Tihany, Hungary
4. Department for Geodynamics and Sedimentology, University of Vienna, 1090 Vienna, Austria
5. Institute of Geophysics, Czech Academy of Sciences, Praha 4, Czech Republic
6. Geomagnetic Observatory, Earth Science Institute, Slovak Academy of Sciences, 947 01 Hurbanovo
7. Geological Survey of Norway, 7491 Trondheim, Norway