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The samples from Leg 29 were mounted in balsam without additional shipboard processing, and then studied and photographed by means of a lightmicroscope. Since the details of the skeletal structure are frequently indistinguishable on the photographs, the author made additional hand drawn illustrations. Four samples were specially washed in order to study the radiolarian skeletons by means of a scanning electron microscope. Special attention was paid to the almost continuous and comparatively undisturbed sequence obtained at Site 278. Other sites of Leg 29 which were studied are shown in Figure 1. These data were compared with the radiolarians in the cores of bottom sediments, taken in the Antarctic and subantarctic by the R/V Ob and Eltanin. Such a comparison was necessary, since some of these cores (Ob Station 256, Eltanin, E-14-8, E-13-4) can be considered as stratotypical for the Pleistocene, Pliocene, and even the uppermost Miocene of high southern hemisphere latitudes. Neither the radiolarian species composition in the studied area, nor the schemes of radiolarian biostratigraphy were known from earlier (older) layers. As a result of the studies herein it was concluded that an age determination of Eocene, Oligocene, and Miocene deposits in the area between 45°-55°S lat is quite possible by means of radiolarians. For the Antarctic Miocene deposits, a rather detailed stratigraphic scheme was suggested. The discussion to follow is supported by data contained in Tables 1-8, and illustrations contained on Figures 1-10.

Cenozoic Radiolarians of the Antarctic, Leg 29, DSDP