The Aegir Ridge is an extinct mid-ocean ridge in the far-northern Atlantic Ocean.[1] It marks the initial line of break-up of the northern Atlantic, along which seafloor spreading was initiated at the beginning of the Eocene epoch. Towards the end of the Eocene, a new spreading ridge, the Kolbeinsey Ridge propagated northwards from Iceland, splitting the Jan Mayen Microcontinent away from the Greenland Plate. As the Kolbeinsey Ridge formed , so activity on the Aegir Ridge reduced, ceasing completely at the end of the Oligocene epoch when the Kolbeinsey Ridge reached the Jan Mayen Fracture Zone.[2]
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