Abstract

Regional single-channel seismic reflection profiles of the Pliocene-Quaternary section on the Scotian Rise have been correlated with biostratigraphic control on Laurentian Fan and the central Scotian Slope. The distribution and age of debris-flow deposits on the rise is correlated with sediment failures on the slope. Debris-flow deposits are as old as the mid-Pliocene, suggesting that glaciation is not a determining cause of sediment failure. On the Scotian Slope, the widespread occurrence of shallow gas and the age and character of several failures suggest that sublimation of gas hydrate, resulting in excess pore pressures, is the principal trigger for sediment failure.

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