Figure 16.9   The Old Red Sandstone lake in northern Scotland: (a) typical preservation of two specimens of Dipterus; and (b) model of environmental cycles in the lake. Sediment is fed in from the surrounding uplands during times of heavy rainfall. Fishes inhabit shallow and surface waters, but carcasses may sink below the thermocline into cold, relatively anoxic waters, where they sink to the bottom and are preserved in undisturbed condition in dark grey laminated muds. (Courtesy of Nigel Trewin.)

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