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Glacial erosion and deposition have shaped the Mertz Trough, East Antarctica, where seafloor grounding-zone wedges (GZWs) are associated with mega-scale glacial lineations (MSGLs) (McMullen et al. 2006). GZWs form along grounded glacial margins constrained by ice shelves during stillstands and consist of wedge-shaped glacially transported sediment (Powell & Domack 2002). MSGLs are parallel elongate bedforms that typically form in soft sediments beneath rapidly flowing ice streams (Clark 1993; Canals et al. 2000; Clark et al. 2003). They are found in glacial troughs, usually parallel to trough margins. MSGLs are generally 6 to >100 km long, 200–1300 m wide and spaced 0.3–5 km apart, crest-to-crest (Clark et al. 2003; McMullen et al. 2006).Mertz Trough is located perpendicular to George V coast of Wilkes Land, East Antarctica (Fig. 1a, b). Multibeam-bathymetric imagery reveals distinct features on the seafloor including parallel elongate ridge and groove pairs, two sinuous sediment mounds with streamlined bedforms on their surfaces, and depressions (Fig. 1c). Fig. 1. Multibeam-bathymetric image of the central Mertz Trough, East Antarctica. ( a ) Location of study area (red box; map from …

Grounding-zone wedges and mega-scale glacial lineations in the Mertz Trough, East Antarctica