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2. Barnes, C. R., Jackson, D. E. and Norford, B. S., 1976. Correlation between Canadian Ordovician zonations based on graptolites, conodonts and benthic macrofossils from key successions. In: M. G. Bassett (Editor), The Ordovician System; Proceedings of a Palaeontological Association Symposium, Birmingham, September 1974, University of Wales Press and National Museum of Wales, Cardiff, pp. 209–226.
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5. Berry, W. B. N. and Boucot, A. J., 1970. Correlation of the North American Silurian rocks. Geological Society of America, Special Paper 102, 289 pp.