TY JOUR TI Geomagnetic field in the vicinity of the Paleozoic-Mesozoic boundary and the Siberian superplume KW Geomagnetic field KW Paleozoic-Mesozoic boundary KW superplume KW paleointensity. JO Russian Journal of Earth Sciences AU Pechersky, D.M. PY 2006 IS 8 PB Geophysical Center of the Russian Academy of Sciences