The biohorizons of calcareous nannofossil and planktonic foraminifers have been intercalibrated for Ocean Drilling Program (ODP) sites drilled during Leg 133 on the northeastern Australian margin. The absence of an independent chronology (e.g., magnetostratigraphy) limits the evaluation of biohorizons for assessing their relative positions within the framework of the best established chronologies. The nannofossil chronology was arbitrarily taken as the reference framework. The order of several late Neogene biohorizons is frequently reversed. Three possible explanations can be invoked: redeposition, inadequate sample spacing, and diachrony. In the absence of proper control on the first two of these explanations, the third possibility cannot be evaluated properly.
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