Middle Pleistocene proximal glaciomarine sediments, recovered in a borehole from the Forth Approaches, include sediment gravity flow deposits interbedded with suspension deposits and ice-rafted detritus. At least two separate flows have been identified; the lower flow (Bed A) is interpreted as the deposit of a gravelly high-density turbidity current or a density modified grain flow, while the upper flow (Bed B) was deposited from a low-density turbidity current. Sedimentation probably occurred on the mid-to-outer part of a subaquatic outwash fan. The association of mass flow and suspension sediments highlights fluctuations in the energy of this ice-proximal setting. © 1987, The Geologists' Association. All rights reserved.
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