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One of the primary objectives of Leg 36 was to obtain additional information on the late Cenozoic glacial history of the Scotia Sea-Argentine Basin region by studying ice-rafted detritus in cores of deep penetration. Coarse clastic material of probable glacial origin was recovered at the five most southerly of the six sites drilled, Sites 326-331. The only subbottom samples collected earlier from this region were piston cores recovered during cruises of the Lamont-Doherty vessels R. V. Vema and R. V. Conrad (Conolly and Ewing, 1965) and of the U.S.N.S. Eltanin. This summary of the distribution and physical characteristics of material believed to be of glacial origin is based primarily on shipboard observations of coarse fraction abundance, texture, and lithology. These studies were later supplemented by standard sieve and pipette grain size analyses that give relative abundances of the coarse sand fraction. In addition, scanning-electron microscopy (SEM) was used to study quartz grain surface textures in samples from Site 328 in order to identify grains of probable glacial origin through application of the criteria of Margolis and Krinsley (1974). We gratefully acknowledge the helpful technical reviews of this paper by Art Ford and Tom Hamilton of the Geological Survey and by Stan Margolis of the University of Hawaii.

Paleoglacial Implications of Coarse Detritus in DSDP Leg 36 Cores