This paper provides the first comprehensive account of fossil microplankton
assemblages from the southern hemisphere. Dinoflagellates,
hystrichosphaerids, and microorganisms of uncertain affinity, all of which
have unmineralized membranes, have been classified. Forty samples from
bores and outcrops have been examined, and 25 genera, of which four are new,
and 75 species, of which 46 are new, have been recorded from Cretaceous and
Tertiary deposits. The data obtained have provided suggestive indications
concerning the age of certain portions of two bores. A number of interesting
facts has arisen from comparisons with the fossil microplanktons from
European sediments.
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