Fig. 3.

a Trough I, showing stratigraphic variation in the width and modal composition of the modally graded layers. Note the change from narrow, steep limbs to wider more shallow limbs, associated with erosion and truncation of the underlying narrow trough. Hammer for scale. b Trough O, showing temporary cessation of trough layering, followed by two stages of migration of the trough axis, with associated erosion and truncation of underlying layers. Rifle for scale. c A succession of events recorded in Trough E, beginning with truncation of a narrow set of modal layers by a wider set, followed by erosion and truncation of the wider set as the axis of the trough moved to the right. The scale card is marked with cm intervals. d A loose block from Trough O, showing clear evidence of truncation of modal layers caused by the migration of the trough axis. Pen for scale. e localised slumping on the southern limb of Trough S, viewed looking towards the east. The sense of slumping is consistent with migration of poorly consolidated mush towards the trough axis. Scale card on the far right shows 1 cm divisions. f Approximately, 60 cm of stratigraphy is formed of distorted layers in this part of Trough O. The package of distorted layers is both under- and overlain by planar, apparently undeformed layers