1. R. Carbonell, A. Pérez-Estaún, J. Gallart, J. Diaz, Instituto de Ciencias de la Tierra, Consejo Superior de Investigaciones Cientificas-Barcelona, 08028 Spain.
2. S. Kashubin, Bazhenov Geophysical Expedition, Scheelite, 624051 Russia.
3. J. Mechie, R. Stadtlander, A. Schulze, GeoForschungsZentrum, D-14473 Potsdam, Germany.
4. J. H. Knapp, Institute for the Study of the Continents, Cornell University, Ithaca, NY 145853, USA.
5. A. Morozov, ROSCOMNEDRA (Committee on Geology and Use of Mineral Resources of the Russian Federation), Moscow, 107140 Russia.