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Tuatara: Volume 28, Issue 2, February 1986

Fig. 4 a and b: Details of fossil changes before and after an extinction episode as reflected in a lineage incapable of evolutionary change (a) and in one capable of evolutionary change (b). In (a) the fauna is severely depleted. In (b) it is as diverse as before and may include new forms. After Milne (1981) by permission of the author

Fig. 4 a and b: Details of fossil changes before and after an extinction episode as reflected in a lineage incapable of evolutionary change (a) and in one capable of evolutionary change (b). In (a) the fauna is severely depleted. In (b) it is as diverse as before and may include new forms. After Milne (1981) by permission of the author.

Fig. 4 a and b: Details of fossil changes before and after an extinction episode as reflected in a lineage incapable of evolutionary change (a) and in one capable of evolutionary change (b). In (a) the fauna is severely depleted. In (b) it is as diverse as before and may include new forms. After Milne (1981) by permission of the author.