Figure 4: Multibeam swath bathymetry maps of streamlined subglacial bedforms on the South Georgia shelf. | Nature Communications

Figure 4: Multibeam swath bathymetry maps of streamlined subglacial bedforms on the South Georgia shelf.

From: Major advance of South Georgia glaciers during the Antarctic Cold Reversal following extensive sub-Antarctic glaciation

Figure 4

(a) Location map indicating the locations of panels b–g. (b) Streamlined crag-and-tails and/or drumlins 0.5–1 km in length, south of Undine South Harbour; (c) streamlined bedforms and roche moutonnée overprinted by extensive scouring in the trough feeding out of Drygalski Fjord; (d) elongated mega-scale glacial lineations and (e) drumlinoid bedforms that increase in elongation down-flow in the trough northwest of Church Bay; (f) convergence of flow patterns including a swarm of small drumlins at the confluence of tributaries emanating from Possession Bay and Antarctic Bay; (g) individual drumlin imaged on flat sea-bed region south of the central part of the island. All multibeam data have an 8 m grid-cell size, except for ‘f’ which is gridded at 20-m cell size. Arrows depict direction of former ice flow.

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