X X X X X X X

boundary stratotype for base of stage parastratotype

Space

Figure 2.6 Key concepts in the definition of stratotypes and parastratotypes applicable to all stratigraphic units. The base of stage X is defined 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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