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Elevation profile B-B' Elevation (m) 50 40 30 20 10 0 Distance (km) 40 35 30 25 20 15 10 5 0 Line 62 B’ B Elevation profile A-A' 40 35 30 25 20 15 10 5 0 Elevation (m) 50 40 30 20 10 0 A A’ Line 04 Distance (km) ! -720 -700 -680 -660 -640 -620 1380 1400 1420 1440 Surface elevation 40 0 Bed elevation 700 0 -1000 A A’ B B’ Trough Trough Ridge Halley 6a Line 04 Line 62 Line 05 psy (km) psx (km) McDonald Ice Rumples Chasm 1 Chasm 2 ’LOW SHELFf’ ’LOW SHELFf’ ’RAILWAY TRACK’ ’RAILWAY TRACK’ ’Railway track’ ’LOW SHELF’ ’LOW SHELF’
