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Analysis of magnetic and bathymétrie data recently collected by Canadian research ships gives no indication of a median ridge or valley in Baffin Bay. However, the shallow depth of the mantle in the center of the bay suggests that the crust is oceanic and may have been created by sea-floor spreading. Tertiary basalts in Davis Strait also could be related to a spreading event. Rapid sedimentation in the basin has obscured basement structures. Magnetic data at present are insufficient to determine the extent and direction of possible spreading.

Seismic profiles on both sides of the bay show horst-and-graben structures which may indicate that the area began to form in the Precambrian and opened primarily during Tertiary time.

The Melville Bay graben may contain a thick section of Cretaceous-Tertiary rocks related to those of the Disko Island area.

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