Figure 2.6   Key concepts in the defi nition of stratotypes and parastratotypes applicable to all stratigraphic units. The base of stage X is defi ned at an appropriate and suitable type section, coincident with the base of biozone Y, which can be used to correlate the base of the stage. The type section is usually conserved and further collecting across the boundary interval is restricted to the parastratotype section. The base of the stage is indicated as XXX. (Based on Temple, J.T. 1988. J Geol. Soc. Lond. 145.)

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