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water depths to ∼450 m and 750 m have been indicated by geophysical Ridge that is truncated to water depths of almost 1000 m along a stretch of ∼60 km at the very center of the Arctic origin. Similar erosional features are found over a much larger area on the Chukchi Borderland, which extends into the interior of the Amerasia Basin (Fig. 1A) (Polyak et al., 2001; Jakobsson et al., 2005). These features include sets of (20Ocean, with the eroded sediment dumped on one side of the ridge. Seismostratigraphy of the eroded area is characterizedIntroduction New high-resolution geophysical mapping of relatively elevated seafloor areas in the Arctic Ocean such as the Lomonosov Ridge, Chukchi Borderland, and Yermak Plateau provide evidence for widespread glaciogenic erosion, shed-ding light on the dramatic history of the Arctic Ocean during glacial times (Fig. 1A; Vogt et al., 1994; Jakobsson, 1999