Figure F28. Conceptual diagrams showing the changes in glacial erosion and sedimentation on the Antarctic continental margin accompanying the change from temperate to cold polar conditions. 1. Glacial onset (middle-late Eocene). Small glaciers fed meltwater and detritus to shelf basins. Coastal plains were vegetated. 2. Small continental glaciers (Oligocene?-early Miocene) fed abundant meltwater and detritus from the central part of the continent to shelf basins and the continental rise. 3. Early advance onto the shelf (middle Miocene). Glaciers start to erode shelf basins, feeding recycled detritus to the continental slope and rise. 4. Shelf overdeepening (late Miocene-Pleistocene glacial episodes). The inner shelf is deeply eroded and detritus is delivered to the shelf, slope, and rise. The extent of the ice sheet determines the relative amounts of basement- and shelf basin-derived detritus provided to the slope and rise. 5. Interglacial episodes (late Miocene-Present). Ice is grounded far from the shelf edge. Slope and rise receive biogenic and hemipelagic sediments and IRD.