Rzehakina epigona und Unterarten dieser Foraminifere

Hiltermann, Heinrich

doi:10.1007/bf02986989

Cited by 5 publications

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“…According to Brouwer they are confined to the abyssal environment even in the high latitudes. Their stratigraphic range is from Cretaceous to Recent, but the presence of Rzehakina epigona at Site 328 restricts this assemblage to the Late Cretaceous-early Eocene interval (Hiltermann, 1974). Similar, but more diversified faunas in association with complex agglutinants, have recently been reported from some southern highlatitude DSDP sites at water depths of 5000 meters.…”

Section: Site 328mentioning

confidence: 59%

Cenozoic Foraminifera from the South Atlantic, DSDP Leg 36

Tjalsma¹

1977

Initial Reports of the Deep Sea Drilling Project

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Cenozoic foraminifera occur in four sites drilled during Leg 36, one in the Drake Passage (Site 326), one in the Falkland Outer Basin (Site 328), and two on the eastern end of the Falkland Plateau (Sites 327 and 329). A calcareous section containing a well-preserved fauna was cored at Site 329. Planktonic foraminifera show that four Tertiary intervals were recovered, upper Paleocene-lower Eocene, Oligocene, lower Miocene, and upper Miocene. Some calcareous planktonics and benthonics are found in the Paleocene-lower Eocene of Site 327. The carbonate-free sediments of Site 328 only yielded an upper Cretaceous-lower Eocene arenaceous benthonic fauna. Planktonic species diversity and faunal composition at Site 329 indicate a progressive warming during the latest Paleocene culminating with the invasion of mid-latitude angular acarininids and keeled morozovellids. Species diversity of Oligocene assemblages is high relative to the latitudinal position of the site. Intense cooling is inferred from extreme low-diversity assemblages in the late Miocene with predominance of Globigerina bulloides. Four distinct benthonic assemblages occur in the Paleocene, lower Eocene, Oligocene, and upper Miocene. Comparison with low and mid-latitude assemblages from the South Atlantic suggests bathyal depth during the Paleocene. The remarkable stability of benthonic assemblages all through the Cenozoic with great similarities (on generic level) in faunal composition is a further indication for the absence of any substantial subsidence of the Falkland Plateau during the Cenozoic. 'Contribution No. 3703 of the Woods Hole Oceanographic Institution. R. C. TJALSMA 60 c 65 C 60° 40°F igure 1. Location of Leg 36 drill sites. 20°P lanktonic foraminifera recovered at two levels show moderate dissolution and sorting as a result of winnowing. The assemblages are assigned to the late Pleistocene to Recent Globorotalia truncatulinoides Zone (sensu Kennett, 1970) based on the presence of the zonal marker which, according to Kennett, invaded the Southern Ocean south of 50°S late in the Brunhes Normal Epoch or about 0.2 m.y. ago. The poor assemblage which also contains Globorotalia inflata, Neogloboquadrina pachyderma (s), Globigerina bulloides, and G. cf. bulloides (sensu Keany and Kennett, 1972) is essentially similar to that reported from this area by Herb (1968).

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