Fortey, R.A., Landing, E., Skevington, D., 1982. Cambrian-Ordovician Boundary Sections in the Cow Head Group, Western Newfoundland, in: Bassett, M.G., Dean, W.T. (Eds.), The Cambrian-Ordovician Boundary: Sections, Fossil Distributions, And Correlations. National Museum of Wales, pp. 95-129.