ABSTRACT
A reflection profile record across the Blake escarpment reveals the presence of a depression in a prominent reflecting horizon adjacent to the base of the escarpment. This depression, which is now buried beneath the overlying unconsolidated sediments, may be erosional in origin and may represent the ancient outer channel of Great Abaco Canyon. The drainage of this channel appears to be restricted along the base of the escarpment south of Great Abaco Canyon, with no apparent grading of the channel to a deeper level farther east. It is suggested that the restriction in drainage was caused by tectonic tilting of the prominent reflector toward the Blake escarpment when this horizon formed the sea floor. The tilting may be related to movements along a subsurface fault about 5 mi (8 km) east of the escarpment bordering Great Abaco Island, and has a strike parallel with this escarpment.
