Placentia Bay, located on the south coast of the island of Newfoundland, is bounded to the west by Burin Peninsula and to the east by Avalon Peninsula (Fig. 1a). At the Last Glacial Maximum (LGM) the Laurentide Ice Sheet extended south of the bay, reaching the edge of the continental shelf (Shaw et al. 2006). Placentia Bay was an onset region for fast-flowing ice in Halibut Channel, a cross-shelf trough beyond the bay. The bay became ice free at c. 14 ka, by which time retreat of Laurentide ice had isolated a Newfoundland ice cap. Placentia Bay has been mapped with multibeam sonar and surveyed with sub-bottom profilers. Results from these activities are contained in 1:50 000 scale shaded-relief maps, backscatter strength maps, a ‘seascape’ map (Shaw et al. 2011) and in various papers (e.g. Brushett et al. 2007; Shaw et al. 2009). The landform assemblage includes: (1) glacially overdeepened troughs; (2) streamlined sedimentary landforms; (3) rock drumlins; (4) flutes overprinting sedimentary drumlins; (5) De Geer moraines superimposed on streamlined landforms; (6) a complex landform suite comprising coast-parallel moraines, drumlins and megaflutes, eskers and hummocky moraine; (7) transverse moraines; (8) submarine slides; and (9) paraglacially modified terrain.