Webby, Barry D., Cooper, Roger A., Bergström, Stig M. and Paris, Florentin. "2. Stratigraphic Framework and Time Slices".
The Great Ordovician Biodiversification Event, edited by Barry D. Webby, Florentin Paris, Mary L. Droser and Ian G. Percival, New York Chichester, West Sussex: Columbia University Press, 2004, pp. 41-47.
https://doi.org/10.7312/webb12678-003Webby, B., Cooper, R., Bergström, S. & Paris, F. (2004). 2. Stratigraphic Framework and Time Slices. In B. Webby, F. Paris, M. Droser & I. Percival (Ed.),
The Great Ordovician Biodiversification Event (pp. 41-47). New York Chichester, West Sussex: Columbia University Press.
https://doi.org/10.7312/webb12678-003Webby, B., Cooper, R., Bergström, S. and Paris, F. 2004. 2. Stratigraphic Framework and Time Slices. In: Webby, B., Paris, F., Droser, M. and Percival, I. ed.
The Great Ordovician Biodiversification Event. New York Chichester, West Sussex: Columbia University Press, pp. 41-47.
https://doi.org/10.7312/webb12678-003Webby, Barry D., Cooper, Roger A., Bergström, Stig M. and Paris, Florentin. "2. Stratigraphic Framework and Time Slices" In
The Great Ordovician Biodiversification Event edited by Barry D. Webby, Florentin Paris, Mary L. Droser and Ian G. Percival, 41-47. New York Chichester, West Sussex: Columbia University Press, 2004.
https://doi.org/10.7312/webb12678-003Webby B, Cooper R, Bergström S, Paris F. 2. Stratigraphic Framework and Time Slices. In: Webby B, Paris F, Droser M, Percival I (ed.)
The Great Ordovician Biodiversification Event. New York Chichester, West Sussex: Columbia University Press; 2004. p.41-47.
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