Table T1. Summary of seismic units and depth reflectors.

Plotted using assumed velocity profile
Reflector	Unit	Time to top (ms TWT)	Assumed velocity (m/s)	Depth to reflector (m)	Thickness (m)	Cumulative thickness (m)	Character of reflections within units
Seabed				0	60
R-1a		80	1510	60	69		Reflectors separate bundles of grouped waves
R-1b		170	1520	129	100
R-1c		300	1530	230	68
R-1d		387	1540	298	66		Faint reflectors; muddier subunit
	A				364	364	South-migrating sediment waves
R-2a		470	1550	364	54
R-2b		523	1600	418	82
	B				136	500	N-onlapping S-prograding and downlapping
R-3		580	1725	500			Paraconformity (onlaps north)
Depth drilled to 627 m
	C				139	639	North-onlapping sediment prism
R-4		730	1750	639			Unconformity Y (Davey, 1977)
	D				1069	1708	Postrift sedimentary cover
Basement		1485	2300	1708			Oceanic crust
Estimated thickness to basement: 1708 m
Plotted using velocity profile provided by downhole measurements
Reflector	Unit	Time to top (ms TWT)	Assumed velocity (m/s)	Depth to reflector (m)	Thickness (m)	Cumulative thickness (m)	Character
Seabed				0	62
R-1a		80	1548	62	73		Reflectors separate bundles of grouped waves
R-1b		170	1591	135	109
R-1c		300	1629	244	74
R-1d		387	1645	318	72		Faint reflectors; muddier subunit
	A				390	390	South-migrating sediment waves
R-2a		470	1660	390	57
R-2b		523	1710	447	54
	B				111	501	N-onlapping S-prograding and downlapping
R-3		580	1728	501			Paraconformity (onlaps north)
Depth drilled to 627 m
	C				130	631	North-onlapping sediment prism
R-4		730	1730	631			Unconformity Y (Davey, 1977)
	D				1076	1708	Post-rift sedimentary cover
Basement		1485	2300	1708			Oceanic crust
Estimated thickness to basement: 1708 m

Note: Horizontal lines separate the main seismic units recognized. Italics indicate unconformities.