An approach to Antarctic glacial history: the aims of Leg 178

Ocean Drilling Program (ODP) Leg 178 was proposed partly as an examination of Antarctic Peninsula glacial history and partly as a test of the strategy of determining this history by sampling glacially transported sediments at the continental margin. If successful, it could lead to a program of two or three other legs around Antarctica that, in combination, might determine the long-term history of the entire Antarctic Ice Sheet. Leg 178 also had a second objective: to obtain a long, highresolution record of Holocene climate from Palmer Deep, an isolated deep basin on the inner continental shelf. The proposal that became Leg 178 was therefore based on several assumptions, described below. Briefly, they are:

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