Figure 20.4   The history of family diversity of the three great “faunas” of marine animals, showing a Cambrian phase, a Paleozoic phase and a “modern” phase. The three phases add together to produce the overall pattern of diversifi cation in Fig. 20.2a. Geological period abbreviations are standard, running from Vendian (V) to Tertiary (T). (Based on Sepkoski 1984.)

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