Fig. 2: Sedimentary grounding zone system mapped on ‘the bump’ seaward of Thwaites ice shelf.
From: Rapid retreat of Thwaites Glacier in the pre-satellite era
a, Geomorphological map of features on and seaward of the bump. Coloured regions are successive sedimentary tops of former grounding zones (GZ 1–3). b, AUV multibeam bathymetry showing a grounding-line moraine marking the edge of a flat-topped lineated ramp. c, Examples of connecting crescentic push-ridges formed on downward-dipping slopes in the northern part of the study area. d, Subglacial meltwater channel and a connected ice-contact fan system. e, Examples of multiple back-stepping grounding lines (small ramps: green, dashed lines), lineations and overprinting ribs shown in more detail in subsequent figures.
