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Middle Ordovician graplolite-rich shales exposed in the southern Appalachians provide an opportunity to apply graphic correlation to what appear to be inadequate data. The fact that the resulting composite standard (CS) is used successfully to address significant geologic problems demonstrates the effectiveness and versatility of the technique. The shales are so strongly diachronous that no single stratigraphic section spans the entire biostratigraphic interval represenled by the shales. The Standard Reference Section (SRS) included only a part of this interval. Therefore, many partially overlapping sections had to be used in the construction of the CS with each section extending the...

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