Correlation of paleogene dinoflagellate assemblages to standard nannofossil zonation in North Atlantic DSDP sites

Upper Middle Eocene to Oligocene Dinoflagellate Biostratigraphy and Assemblage Variations in Hole 913B, Greenland Sea

“…Therefore, this taxon is not useful for distinguishing the middle and upper Eocene in Hole 913B. Damassa et al (1990) record the restricted range of Cribroperidinium sp. 2 within the upper Eocene of many North Atlantic and Norwegian-Greenland Sea DSDP sites.…”

“…The range of this taxon is questionable, as there are some large discrepancies reported in the literature. Damassa et al (1990) report F. axialis in the upper Paleocene to lower Eocene of several DSDP sites, which by comparison would suggest that it is reworked in Hole 913B. On the other hand, Williams et al (1993) report its range from upper Eocene to lower Oligocene.…”

“…Magnetic reversal stratigraphy of the non-volcanic Paleogene sequence at Sites 642 and 643 is poor to absent (Eldholm, Thiede, Taylor, et al, 1987). Damassa et al (1990) reported initial results of biostratigraphically useful dinocysts in Paleogene sediments from numerous North Atlantic and Norwegian-Greenland Sea DSDP sites. They did not include complete range charts, but only listed ranges and datums of selected species that appear to be correlative across this wide geographic region.…”

“…Consequently, Manum et al (1989) suggested that the occurrence of H. porosa was evidence for the lack of any recognizable upper Eocene sediments at Site 643. However, Damassa et al (1990) and Head and Norris (1989) both report H. porosa in upper Eocene sediments, based on the correlation to calcareous nannofossil zonations. Therefore, its range up to Sample 913B-25R-2,110-113 cm, does not necessarily indicate that middle Eocene strata occur up to this level within Hole 913B, nor does it necessarily indicate that this taxon has been reworked.…”

Mid- to Late Eocene organic-walled dinoflagellate cysts from ODP Leg 171B, offshore Florida

“…Unfortunately, studies from mid-to high-latitude Eocene to Oligocene deep-water settings are rather scarce (Manum 1976;Costa & Downie 1979;Goodman 1983;Head & Norris 1989;Damassa et al 1990), and poorly calibrated. Therefore, although EoceneOligocene taxa have been documented from such sections, their chronostratigraphic usefulness is poorly known.…”