Institution: | International Commission on Stratigraphy, Department of Palaeobiology, University of Uppsala, Box 564, S-75122 Uppsala, Sweden;International Commission on Stratigraphy, Departament of Geology, National Museum of Wales, Cardiff CF1 3NP, U.K.;Subcommission on Silurian Stratigraphy, Department of Geology, Trinity college, Dublin 2, Ireland |