Figure 3: Glacial geomorphological mapping.
From: Discovery of relict subglacial lakes and their geometry and mechanism of drainage
See the methods—Geomorphology for details. (a) Site 1 (Fig. 1b) and surrounding region, (b) Site 2 (Fig. 2a) and surrounding region. Mapping reveals a large number of flat spots that represent potential palaeo-subglacial lakes. They typically occur in linear clusters perched behind upland ridges running transverse to ice flow. There are two scales of drainage system (marked on b): (i) large (subglacial/proglacial) meltwater spillways that are not connected with flat spots, which cut across the transverse ridges, and (ii) small subglacial channels and associated eskers that often lead into and out of flat spots.
