New seismic reflection data, including a nearly 400 km long continuous strike tie.
Correlation of regional seismic reflectors R1 to R6 and reflector R4A (ODP Site 986).
Sedimentary units thicker within three TMFs and thinner in the inter-TMF areas.
Relatively uniform units occur below R4A while thickness variations occur above.
We infer that reflector R4A marks the onset of the TMF development on this margin.