Table T3

Table T3. Summary of stratigraphic relations at Site 1174 and correlation with equivalent units at Sites 808 and 1173.

Unit	Sub-unit	Facies name	Interval (cm)		Depth (mbsf)		Thickness (m)	Stratigraphic age	Lithologic description
Unit	Sub-unit	Facies name	Top	Bottom	Top	Bottom	Thickness (m)	Stratigraphic age	Lithologic description
			190-1174A-	190-1174A-
I		Slope apron	1H-1, 0	1H-CC, 0	0.00	4.00	4.00	Quaternary	Hemipelagic mud, rare volcanic ash
			190-1174A-	190-1174B-
II	IIA	Axial-trench wedge	1H-CC, 0	19R-1, 55	4.00	314.55	310.55	Quaternary	Sand, muddy sand, silt turbidites, hemipelagic mud
			190-1174B-	190-1174B-
	IIB	Outer-trench wedge	19R-1, 55	31R-2, 105	314.55	431.55	117.00	Quaternary	Silt turbidites, hemipelagic mud
	IIC	Trench to basin transition	31R-2, 105	36R-5, 73	431.55	483.23	51.68	Quaternary	Silt turbidites, volcanic ash, hemipelagic mud
III		Upper Shikoku Basin	36R-5, 73	55R-2, 49	483.23	660.99	177.76	Quaternary-Pliocene	Hemipelagic mud, volcanic ash
IV		Lower Shikoku Basin	55R-2, 49	101R-CC, 21	660.99	1102.45	441.46	Pliocene-Miocene	Hemipelagic mud, siliceous claystone, calcareous claystone
V		Volcaniclastic	101R-CC, 21	102R-CC, 26	1102.45	1111.31	8.86	Miocene	Hemipelagic mud, altered volcanic ash

Unit	Sub-unit	Processes of formation	Tectonic and physiographic setting	Statigraphic correlation
Site 808	Site 1173


I		Hemipelagic settling	Lowermost trench slope	Unit I

II	IIA	Turbidity currents in axial channel, hemipelagic settling	Axis of trench floor	Units IIA, IIB

	IIB	Lateral margins of turbidity currents, hemipelagic settling	Seaward margin of trench floor	Unit IIC	Unit IA
	IIC	Rare turbidity currents, air-fall ash, hemipelagic settling	Transition from trench to Shikoku Basin	Unit III	Unit IB
III		Hemipelagic settling, air-fall ash	Shikoku Basin - closer to trench; volcanism in Kyushu/Honshu	Unit IVA	Unit II
IV		Hemipelagic settling, diagenetic alteration	Shikoku Basin - distal to trench	Unit IVB	Unit III
V		Acidic volcanism, hemipelagic settling	Japan Outer Zone volcanism - triggered by ridge subduction	Unit V	Unit IV

Unit Sub-unit Processes of formation Tectonic and physiographic setting Statigraphic correlation

Site 808

Site 1173

I
Hemipelagic settling Lowermost trench slope Unit I

II IIA Turbidity currents in axial channel, hemipelagic settling Axis of trench floor Units IIA, IIB

IIB Lateral margins of turbidity currents, hemipelagic settling Seaward margin of trench floor Unit IIC Unit IA

IIC Rare turbidity currents, air-fall ash, hemipelagic settling Transition from trench to Shikoku Basin Unit III Unit IB

III
Hemipelagic settling, air-fall ash Shikoku Basin - closer to trench; volcanism in Kyushu/Honshu Unit IVA Unit II

IV
Hemipelagic settling, diagenetic alteration Shikoku Basin - distal to trench Unit IVB Unit III

V
Acidic volcanism, hemipelagic settling Japan Outer Zone volcanism - triggered by ridge subduction Unit V Unit IV