Rachel Wood (2000) discussed changes in the Devonian reef- building biota across the Frasnian-Famennian (F-F) boundary in the Canning basin. This boundary coincides with a major mass extinction of metazoans, yet Wood concluded that the Famennian reef-building community shows “no noteworthy changes in biodiversity” (p. 990) when compared with its Frasnian precursor. We are unable to agree with that conclusion or with many others in Wood's paper.

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Reefal platforms in the Canning basin were built by calcimicrobes during the Famennian and by calcimicrobes and metazoans (stromatoporoids and corals) in the Givetian and Frasnian. The reef-building corals largely disappeared in the...

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