FIGURE 3. Ice sheet cross-sections along the line of ice flow from the ice divide, across Lake Vostok, to the Vostok ice core.
From the following article:
Physical, chemical and biological processes in Lake Vostok and other Antarctic subglacial lakes
Martin J. Siegert, J. Cynan Ellis-Evans, Martyn Tranter, Christoph Mayer, Jean-Robert Petit, Andrey Salamatin and John C. Priscu
Nature 414, 603-609(6 December 2001)
doi:10.1038/414603a
a, Suggested ice particle flowpaths between ridge B and the southern end of Lake Vostok (Fig. 1a). The bedrock elevation has been measured from airborne RES2. b, Raw records along an ice surface flowline across Lake Vostok, showing the pattern of internal layering. Also shown are disturbances to the otherwise smooth ice-sheet base above the lake, which may reflect shallow lake conditions and ice-sheet grounding. c, Interpretation of the RES data provided in b.