Postglacial sea-level lowstand on Cumberland Peninsula, Baffin Island, Nunavut

This study investigates the postglacial sea-level history of eastern Cumberland Peninsula, a region Baffin Island, Nunavut, where submerged terraces were documented in 1970s. The elevation gradient emerged marine-limit deltas and fiord-head moraines led Arthur Dyke to propose conceptual model for continuous submergence peninsula. Multibeam mapping over past decade has revealed eight unequivocal at 19–45 m below present sea level (b.s.l.) other relict shore-zone landforms (boulder barricade, spits, sill platform) 16–51 b.s.l. Over distance 115 km from Qikiqtarjuaq Cape Dyer, coastal features increase depth toward east, with slope (0.36 m/km) less than that shoreline previously (0.58–0.62 m/km). ice-proximal deltas, deglacial ice limits, radiocarbon ages constrain lowstand between 9.9 1.4 ka cal BP. glacial-isostatic ICE-7G_NA (VM7) computes relative 8.0 ka, which increases eastward 0.28 m/km. difference observed model-derived depths ranges 1 west 10 east predicted tilt is significantly (p = 0.0008). results, emerging data on Holocene glacial readvances evidence proglacial delta formation point Cockburn (9.5–8.2 ka) age lowstand, most likely later this range. confirms 1970s outer Peninsula provides field further refinement adjustment models.