Figure 2: Glacial geomorphology at Site 2 and its geophysical and sedimentological characteristics.
From: Discovery of relict subglacial lakes and their geometry and mechanism of drainage
(a) Glacial geomorphology of Site 2, showing the location of a palaeo-subglacial lake (flat spot) connected to a number of inflowing and outflowing subglacial meltwater channels and eskers. Lines 39–44 are a GPR profile shown in b. Yellow dot is the location of sediment core in c. See Supplementary Fig. 1b for mapping of flat spots, meltwater channels, eskers, crevasse squeeze ridges and outwash fans. (b) GPR profile across the flat spot showing the burial of glacial lineations in up to 10 m of glaciolacustrine sediments (Supplementary Fig. 6 shows the raw data). (c) Sediment log of a core recovered near the edge of a flat spot. This includes calibrated radiocarbon ages displayed with 2 sigma error, LOI data and particle size characteristics (see the Methods—Sedimentology for details).
