J. H. Callomon, D. T. Donovan; Stratigraphic classification and terminology. Geological Magazine ; 103 (1): 97–99. doi:
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With reference to the paper by H. D. Hedberg on stratigraphic classification and terminology, particularly as they refer to the Jurassic, exception is taken to the distinction drawn between biostratigraphic and chronostratigraphic units.
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