Figure 4.16   Construction of a rarefaction curve based on data collected from a mid-Devonian brachiopod-dominated fauna, northern France. The main types of brachiopod are illustrated: (a) Schizophoria, (b) Douvillina, (c) Productella, (d) Cyrtospirifer, (e) Rhipidiorhynchus, and (f) Athyris. The curve levels off at about 300 specimens, suggesting this sample size is a suffi cient census of the fauna. Magnifi cation approximately 0.5 for all.

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