1. Early Silurian oceanic episodes and events
2. The faunal extinction event near the Ordovician-Silurian boundary: a climatically induced crisis;Barnes;Global Bioevents,1986
3. Barnes C.R. Fortey R.A. Williams S. H. (1995) in Global Events and event stratigraphy, The pattern of global bio-events during the Ordovician Period, ed Walliser O. H. (Springer-Verlag), pp 139–172.
4. Bathymetric and isotopic evidence for a short-lived Late Ordovician glaciation in a greenhouse period
5. The Ordovician-Silurian boundary;Cocks;Episodes,1985