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Site 325 was drilled on the continental rise of the Bellingshausen Sea (65°2.79'S; 73°40.40'W) during DSDP Leg 35, the third cruise into Antarctic waters. A single hole was drilled in 3745 meters of water which penetrated 718 meters of sediment. Terrigenous sediments of gray and greenish clay, silty claystone, silts, and sandstones characterize the early Miocene to Pleistocene deposits. The hole bottomed in lithified sandstones and conglomerates. The Pleistocene to late Miocene sediments yielded primarily well-preserved siliceous fossils; however, a sparse fauna of planktonic foraminifera, characteristic of high latitudes, was found in the uppermost PliocenePleistocene part of the hole. A fauna of arenaceous benthonic foraminifera accompanied by a few calcareous specimens occurs beginning in Core 7 (moving downhole), at about 520 meters subbottom. One sample (325-10-1, 94-96 cm) at 709.5 meters contains the planktonic foraminiferal species Globorotalia zealandica incognita indicating that it is in the foraminiferal Zone N 6 to N 7 (early Miocene). Within this section containing calcareous fossils, individuals of the fossil group Bolboforma were found at 615.3 meters (325-8-2, 133-135 cm). The genus Bolboforma has been described from the Oligocene and Miocene of northern Germany (Daniels and Spiegler, 1974) and the systematic position of this taxon is discussed below. The occurrence of Bolboforma at Site 325 in the early Miocene sediments, as determined by planktonic foraminifera, is in agreement with its occurrence in northern Germany. Bolboforma appears to be a fossil group with significant stratigraphic value. The depositional environment of this part of the section at Site 325 was middle to lower bathyal. The dominance of more primitive genera of arenaceous foraminifera and the occurrence of deep water calcareous benthonic species indicate water depths of 23000 meters. Bolboforma is believed to be of planktonic origin.

The Occurrence of Bolboforma, a Probable Algal Cyst, in the Antarctic Miocene of DSDP Leg 35