A study of the Foraminifera contained in cores from the Barlett Deep

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Abstract
Three cores taken in the Bartlett Deep show decided changes during the time represented by their deposition. The foraminiferal content varies greatly and shows periods of absence of pelagic foraminifera due possibly to a change in the position of warm tropical currents during the periods of accumulation of polar ice. These periods alternate with others of great abundance of pelagic forms. The occurrence of shallow water forms at great depths may also be accounted for by radical changes in sea level.