Ocean Drilling Program (ODP) Leg 188 was drilled based on one of five linked proposals to decipher the Cenozoic glacial history and paleoenvironments of Antarctica by drilling transects across the continental margin in five different regions. ODP Leg 178 (Antarctic Peninsula) was the first such proposal to be drilled. Three sites were drilled during Leg 188, with one each on the Prydz Bay continental shelf, slope, and rise. These sites document the paleoenvironments for select periods during Cenozoic and older times as Antarctica transformed from a temperate to a polar setting. The sites provide records of the transition from East Antarctic preglacial to glacial conditions on the shelf (Site 1166); the variability of ice sheet extent, sediment source areas, and glaciomarine depositional processes during latest Neogene glacial-interglacial periods on the slope (Site 1167); and the long-term lower to upper Miocene transition from a temperate climate to cold-climate glaciation, with superimposed short-term glacier fluctuations since early Miocene time (Site 1165).
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