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Figure F5. Chirp sonar records of the Lomonosov Ridge crest (Jakobsson, 1999). Black arrows mark prominent reflectors used by Jakobsson (1999) to subdivide the stratigraphy into seismoacoustic units. A. Profile showing the substantial erosion that was mapped in water depths shallower than 1 km. A pronounced unconformity due to the erosion is indicated with a white arrow. B. Profile acquired in water depths deeper than 1 km, showing an apparently undisturbed sediment stratigraphy within the resolution of the chirp sonar (20–40 cm).

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