Australasian mid-Tertiary larger foraminiferal associations and their bearing on the East Indian Letter Classification

Eight larger foraminiferal associations are found in northwest Australia; some can be recognised in other areas of Australia, New Zealand, Papua New Guinea, and Irian Jaya. Correlation with the East Indian Letter Classification can be made for some associations, but there is difficulty with others, owing to the absence of diagnostic forms. Planktic faunas are present in some of the associations, enabling direct correlation with the tropical planktic zonal scheme. In those non-diagnostic associations containing Cycloclypeus or Lepidocyclina (Nephrolepidina), correlation with the East Indian Letter Classification can be achieved using biometric methods. The Tertiary e stage - Tertiary f stage boundary is placed within the N.6-7 zonal interval.