Claus Heilmann-Clausen (a), Bo Pagh Schultz (b), Claus Beyer (c), Henrik Friis (a), Petra L. Schoon (d) & Christian Tegner (a)
(a) Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, 8000 Aarhus C, Denmark. E-mail: claus.heilmann@geo.au.dk
(b) Muserum, Division of Natural History, Havnevej 14, 7800 Skive, Denmark.
(c) CB-Magneto, Nørregade 27, 8670 Låsby, Denmark.
(d) Department of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden.