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In the radiolarian biostratigraphy of the Cenozoic Era, only the majority of Paleocene Epoch has hitherto remained unzoned. Submarine sediments recovered from DSDP Sites 208 and 327 of the southern ocean, contain rich and well-preserved radiolarians, thus providing an opportunity to fill this gap and to complete the radiolarian zonal scheme. The majority of forms, including some new taxa, are presented and discussed.
A rather diversified radiolarian fauna appears in early early Paleocene, but species belonging to the genus Byryella made their initial appearances only during the middle Paleocene. Throughout the Paleocene, numerous well-known Cenozoic forms made their first appearance. By using co-occurring microfossils for stratigraphic correlation, these initial appearances can be placed within the pre-existing planktonic zonation and geochronometric framework. The phylogeny of Byryella has been investigated throughout the Paleocene section.
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