Acknowledgements
We thank Keith Bennett, Robert Blatter, Marie-France Deguilloux,
Susan Hoebee, Rolf Holderegger, and the anonymous
referees for critically reading and improving earlier versions
of the article. Financial support was granted through the EUfunded
project Fossilva (EVK2-1999-00015P; F. G., R. J. P.),
the Swiss Federal Office for Education and Science (BBW
99.0689-2), the Swiss National Science Foundation (3100A0-
101218; F. G.), the Laboratoire de Recherches sur les Monuments
Historiques (R. J. P.), the Swedish Research Council, the Swedish
Foundation for International Cooperation in Research and
Higher Education (STINT) and the Carl Trygger Foundation
(L. P.).