Abstract
Peake and Freen Deeps are two flat-bottomed depressions situated in the eastern foothills of the Mid-Atlantic Ridge near 43°N, 20°W. Seismic reflection profiling shows that they are partially filled with horizontally stratified sediments. Small-scale faulting within the sediments and tilting of the floors of flat-bottomed sediment pockets to the north and south of the deeps indicate only minor structural adjustments in the area since the onset of deposition in the two troughs. Closely-spaced core samples from the region contain two types of material. The first kind is a modified pelagic sediment in which climatic changes are recorded by variations in the foraminiferal fauna and in the amount and composition of mineral debris. The second is a coarse foraminiferal sand which occurs as thin layers in the bottom of the deeps. These sand layers are interpreted as turbidity current deposits composed of locally derived material. The histories of sedimentation in the two deeps appear to have been different, in spite of their close proximity.
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