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- W2015590050 abstract "A reliability assessment of 20 commonly employed Late Pliocene and Pleistocene calcareous plankton biostratigraphic datums published for 30 DSDP holes has revealed a subset of ten which appear to be reasonably isochronous and consistently recognizable by a large number of biostratigraphers. The assessment is based on an analysis of datum rank order reliability, and is supplemented by an examination of the absolute age estimates for the same 20 datums which were derived using the paleomagnetic stratigraphy presented for 19 of the 30 holes. The results indicate only four of the initial eleven datums based on planktonic foraminifers can be considered reliable, compared to seven reliable calcareous nannofossil datums of an initial nine. Compared to calcareous nannofossils, planktonic foraminifera thus show greater provincialism and more fluid ecophenotypic and evolutionary changes, implying that they are more interesting subjects for evolutionary studies but relatively less suitable tools for biostratigraphy. An important datum rejected by this assessment is the first appearance datum (FAD) of the planktonic foraminiferGloborotalia truncatulinoides, once considered a reliable indicator of the Plio-Pleistocene boundary. While the FAD for this species occurs at its commonly accepted level of approximately 1.9 Ma in the equatorial Pacific and throughout the temperate and tropical Atlantic, its age in the Indo-Pacific between about 15°S and 40°S is strongly diachronous. The earliest FAD is dated at a maximum of 2.6–2.7 Ma between about 20°S and 35°S in the Indo-Pacific. A global extremum in the average size of Holocene populations has been previously recognized within this same latitudinal zone." @default.
- W2015590050 created "2016-06-24" @default.
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- W2015590050 date "1989-05-01" @default.
- W2015590050 modified "2023-09-23" @default.
- W2015590050 title "Plio-Pleistocene calcareous plankton biochronology" @default.
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- W2015590050 doi "https://doi.org/10.1016/0377-8398(89)90032-7" @default.
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