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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 19 (1969), Pages 585-599

Correlation of Neogene Planktonic Foraminifer and Calcareous Nannofossil Zones

Stefan Gartner, Jr.

ABSTRACT

From the uppermost Miocene (Messinian) to the Recent six planktonic foraminiferal zones have been recognized in tropical and subtropical latitudes. Using overlapping segments from deepsea cores previously dated by means of planktonic foraminifers, the calcareous nannofossils were analyzed for this same interval in order to relate nannofossil ranges to the established foramineferal zones.

With the light microscope ten calcareous nannofossil zones are readily distinguishable for this interval, two for the uppermost Miocene (Messinian), five for the Pliocene, and three for the Quaternary-Recent. The late Miocene-Pliocene nannofossil zones are based primarily on partial ranges and concurrent ranges of species of Discoaster and Ceratolithus, whereas the Quaternary nannofossil zones are based on partial ranges and concurrent ranges of three placolith genera that successively dominate the nannofossil assemblage.

The boundaries of the calcareous nannofossil zones do not correspond to the boundaries of the planktonic foraminifer zones, although in some cases they are relatively close. One exception is the top of zone N-21, which is marked by the first evolutionary occurrence of Globorotalia truncatulinoides, and which corresponds rather closely to the extinction of discoasters in deep-sea sediments.


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