Chirp sonar profile (b) from the crest of the Lomonosov Ridge, central Arctic Ocean (a), where an ice shelf is inferred to have grounded and produced glacial.

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Chirp sonar profile (b) from the crest of the Lomonosov Ridge, central Arctic Ocean (a), where an ice shelf is inferred to have grounded and produced glacial landforms closely resembling mega-scale glacial lineations (Jakobsson 1999; Jakobsson et al. 2016). Chirp sonar profile (b) from the crest of the Lomonosov Ridge, central Arctic Ocean (a), where an ice shelf is inferred to have grounded and produced glacial landforms closely resembling mega-scale glacial lineations (Jakobsson 1999; Jakobsson et al. 2016). The chirp profile was acquired with an EdgeTech SC-512 tow-fish and 100 ms long 2–4 kHz chirp pulse. The relatively narrow undulations in the seafloor are associated with marked hyperbolae. M. Jakobsson et al. Geological Society, London, Memoirs 2016;46:17-40 © 2016 The Author(s). Published by The Geological Society of London