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2. Becker, R.T., House, M.R. and Ashouri, A.‐R. Potential stratotype section for the Frasnian‐Famennian boundary at El Atrous, Tafilalt, Morocco. Document Submitted to the International Subcommission on Devonian Stratigraphy Meeting. 1988, Rennes. pp.6
3. Ser. II;Becker R.T.,1989
4. Frasnian/Famennian mass extinction and cold-water oceans