Terminal and recessional moraine ridges are built up on high-latitude continental shelves and in fjords during glacial maxima and still-stands punctuating deglaciation. Such ridges are often found in association with relatively shallow banks and are seldom located in major crossshelf troughs where past ice streams tend to have produced subglacial landforms streamlined in the direction of former ice flow (e.g. Dahlgren et al. 2002; Dowdeswell & Elverhøi 2002; Ottesen & Dowdeswell 2009). Many of these ridges are relatively large, at tens of metres in height above the general level of the seafloor, and have been modified little during the Holocene (e.g. Ottesen et al. 2005). The preservation of these prominent submarine glacial landforms is often linked to relatively low interglacial sedimentation rates and to the lowenergy process environment that is typical of many polar shelves after deglaciation. An exception, however, is where moraine ridges are present at relatively shallow water depths, a situation sometimes enhanced by isostatic rebound during the Holocene. In these circumstances, current and wave action can result in significant modification of moraine ridges.