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Figure 13.—A, Schematic map of the Edoma “Ice Complex” in northern Siberia. (1) Areas of extensive occurrences of the ice complex across a range of landforms; (2) areas of the ice complex occurring only in river valleys and lake depressions; 3–5 southern boundaries of regions of contemporary ice wedge development: in (3) peat deposits; (4) silt and clay deposits; (5) sand and gravel deposits; (6) southern boundary of the regions of low-centered polygons; (7) southern boundary of permafrost (N.N. Romanovskii, 1993). B, Exposure of eroding Edoma deposit along the Laptev Sea coast, northern Siberia, Russia (photograph by Volker Rachold).