Figure from A new mechanism for diatom emplacement and concentration in glacigenic deposits

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Figure 2. Model illustrating transport of diatoms (and other particles) deposited by winds on the ice-sheet surface. A . Ice sheet with basal melting. Note that diatoms (D) are deposited beneath the ice sheet in basal till. B . Ice sheet with frozen bed. Note that diatoms are carried to the ice-sheet margin where they may accumulate in end moraines. C . Ice sheet with freezing bed. Note that diatoms are carried to the surface at locations below the equilibrium line (E). D . A marine-based ice sheet flowing into an ice shelf. Note diatoms deposited beneath grounded ice as in A but also settling out beneath the ice shelf where released by basal melting (D*).