Table T1. Petrographic features of sediments from footwall Sites 1114 and 1116. (See table notes. Continued on next page.)

Table T1. Petrographic features of sediments from footwall Sites 1114 and 1116.

Age

Core, section, interval (cm)

Depth
(mbsf)

Lithology

Matrix/Cement

Lithic fragments

Bioclasts

Organic carbon

180-1114A-

Quaternary? 1R-CC, 1-6 0.01 Nannofossil-foraminifer sand

1R-CC, 34-36 0.34 Siltstone Carbonatic, argillaceous Volcanics Planktonic and benthic foraminifers

middle to late Pliocene 3R-1, 50-52 17.10 Fine-grained sandstone Carbonatic, argillaceous, volcanic Shards Foraminifers, shell debris X

5R-1, 24-26 36.04 Fine-grained sandstone Carbonatic, argillaceous, volcanic Shards Foraminifers, shell debris X, as ribbons

6R-2, 68-72 46.65 Silty clay Argillaceous Shards

8R-1, 16-20 64.76 Siltstone Argillaceous Altered shards, volcanics Shell debris

9R-2, 15-17 75.77 Fine-grained sandstone Argillaceous
Foraminifers, shell debris X

11R-CC, 18-20 95.24 Fine-grained sandstone Carbonatic matrix
Foraminifers X

12R-1, 3-4 103.23 Fine-grained sandstone Carbonatic matrix

12R-1, 88-91 104.08 Carbonaceous fine-grained sandstone Carbonatic matrix Shards, volcanics Shell debris

13R-1, 90-93 113.70 Fine- to medium-grained sandstone Glassy Shards, volcanics

14R-1, 96-98 123.36 Siltstone Argillaceous, glassy
Foraminifers, shell debris X

14R-1, 106-108 123.46 Fine- to medium-grained sandstone
Andesites, siltstones Benthic foraminifers

15R-1, 46-48 132.46 Fine- to coarse-grained sandstone Carbonatic cement Andesites

16R-CC, 12-15 141.72 Medium-grained sandstone
Andesites

21R-1, 11-14 189.91 Fine-grained sandstone
Andesites

22R-1, 74-76 200.14 Fine-grained sandstone Carbonatic, argillaceous, glassy Shards Shell debris X

22R-1, 77-80 200.17 Sandy siltstone Argillaceous Volcanics, serpentine schists, chlorite schists Planktonic foraminifers X

23R-1, 70-72 209.50 Fine-grained sandstone Carbonatic, argillaceous, glassy Shards Shell debris X

24R-1, 33-35 218.72 Coarse-grained sandstone
Andesites, felsites

24R-2, 20-23 218.99 Coarse-grained sandstone

26R-1, 96-97 238.56 Coarse-grained sandstone Glassy Shards, andesites, felsites

26R-CC, 1-3 238.82 Coarse-grained sandstone

27R-CC, 9-21 247.49 Coarse-grained sandstone

28R-CC, 3-5 256.93 Coarse-grained sandstone
Granite

28R-CC, 3-7 256.93 Coarse-grained sandstone Argillaceous Andesites, felsites, chlorite schists

30R-1, 47-51 276.57 Silty claystone Argillaceous

30R-CC, 1-4 277.07 Fine- to medium-grained sandstone Glassy Shards, volcanics

31R-1, 15-17 285.95 Calcareous silty clay Argillaceous

180-1116A-

Pliocene 1R-1, 58-60 0.58 Medium- to coarse-grained sandstone Glassy Shards, felsites, andesites, trachytes, basalts, gabbros, serpentinites, granites, amphibole schists, talc schists Shell debris

2R-CC, 11-14 8.0 Sandy siltstone

3R-1, 13-15 16.33 Fine-grained sandstone Carbonatic matrix Volcanics, basalts, serpentinites, chlorite schists Shell debris X, as ribbons

3R-1, 42-44 16.62

4R-2, 1-4 25.51 Silty sandstone

5R-1, 18-20 33.98

5R-1, 79-81 34.59 Orthoconglomerate Argillaceous Andesites, basalts, dolerites, gabbros, limestones

6R-1, 9-11 42.49 Conglomerate Carbonatic matrix Andesites, dolerites, gabbros, serpentinites, Prh-Pmp metabasalts Benthic foraminifers, algae

6R-1, 37-39 42.77 Conglomerate Carbonatic matrix Andesites, dolerites, gabbros, serpentinites, Prh-Pmp metabasalts

7R-1, 58-60 48.58 Conglomerate Carbonatic matrix Andesites, trachytes, basalts, dolerites, gabbros, cherts

7R-CC, 5-7 48.67 Silty sandstone Argillaceous Andesites

9R-1, 122.5-126 63.83 Silty sandstone Carbonatic cement
Foraminifers

9R-1, 138-141 63.98 Carbonaceous fine-grained sandstone Carbonatic matrix

11R-1, 16-19 81.96 Medium-grained sandstone Argillaceous Volcanics Shell debris

12R-1, 2-6 91.42 Fine-grained sandstone Argillaceous Volcanics, serpentine schists, prehnite

13R-2, 25-27 102.07 Fine-grained sandstone Glassy Shards Shell debris

13R-4, 51-54 103.55 Fine-grained sandstone Glassy Shards Shell debris

14R-1, 50-52 111.10 Fine- to medium-grained sandstone Argillaceous

16R-1, 103-106 131.03

16R-1, 103-107 131.03 Fine- to medium-grained sandstone Argillaceous Andesites Foraminifers

16R-3, 6-8 132.22

16R-3, 134-136 133.50 Fine-grained sandstone Glassy, argillaceous Shards, volcanics Benthic and planktonic foraminifers X

17R-2, 53-55 141.73 Interbedded fine-grained sandstone and siltstone Cement/argillaceous Volcanics Benthic foraminifers

18R-1, 30-32 149.60 Interbedded fine-grained sandstone and siltstone Cement/argillaceous Volcanics Benthic foraminifers

18R-2, 11-15 150.32 Interbedded medium-grained sandstone and siltstone Cement/argillaceous Volcanics Benthic foraminifers

Age	Core, section, interval (cm)	Depth (mbsf)	Lithology	Matrix/Cement	Lithic fragments	Bioclasts	Organic carbon
	180-1114A-
Quaternary?	1R-CC, 1-6	0.01	Nannofossil-foraminifer sand
	1R-CC, 34-36	0.34	Siltstone	Carbonatic, argillaceous	Volcanics	Planktonic and benthic foraminifers
middle to late Pliocene	3R-1, 50-52	17.10	Fine-grained sandstone	Carbonatic, argillaceous, volcanic	Shards	Foraminifers, shell debris	X
	5R-1, 24-26	36.04	Fine-grained sandstone	Carbonatic, argillaceous, volcanic	Shards	Foraminifers, shell debris	X, as ribbons
	6R-2, 68-72	46.65	Silty clay	Argillaceous	Shards
	8R-1, 16-20	64.76	Siltstone	Argillaceous	Altered shards, volcanics	Shell debris
	9R-2, 15-17	75.77	Fine-grained sandstone	Argillaceous		Foraminifers, shell debris	X
	11R-CC, 18-20	95.24	Fine-grained sandstone	Carbonatic matrix		Foraminifers	X
	12R-1, 3-4	103.23	Fine-grained sandstone	Carbonatic matrix
	12R-1, 88-91	104.08	Carbonaceous fine-grained sandstone	Carbonatic matrix	Shards, volcanics	Shell debris
	13R-1, 90-93	113.70	Fine- to medium-grained sandstone	Glassy	Shards, volcanics
	14R-1, 96-98	123.36	Siltstone	Argillaceous, glassy		Foraminifers, shell debris	X
	14R-1, 106-108	123.46	Fine- to medium-grained sandstone		Andesites, siltstones	Benthic foraminifers
	15R-1, 46-48	132.46	Fine- to coarse-grained sandstone	Carbonatic cement	Andesites
	16R-CC, 12-15	141.72	Medium-grained sandstone		Andesites
	21R-1, 11-14	189.91	Fine-grained sandstone		Andesites
	22R-1, 74-76	200.14	Fine-grained sandstone	Carbonatic, argillaceous, glassy	Shards	Shell debris	X
	22R-1, 77-80	200.17	Sandy siltstone	Argillaceous	Volcanics, serpentine schists, chlorite schists	Planktonic foraminifers	X
	23R-1, 70-72	209.50	Fine-grained sandstone	Carbonatic, argillaceous, glassy	Shards	Shell debris	X
	24R-1, 33-35	218.72	Coarse-grained sandstone		Andesites, felsites
	24R-2, 20-23	218.99	Coarse-grained sandstone
	26R-1, 96-97	238.56	Coarse-grained sandstone	Glassy	Shards, andesites, felsites
	26R-CC, 1-3	238.82	Coarse-grained sandstone
	27R-CC, 9-21	247.49	Coarse-grained sandstone
	28R-CC, 3-5	256.93	Coarse-grained sandstone		Granite
	28R-CC, 3-7	256.93	Coarse-grained sandstone	Argillaceous	Andesites, felsites, chlorite schists
	30R-1, 47-51	276.57	Silty claystone	Argillaceous
	30R-CC, 1-4	277.07	Fine- to medium-grained sandstone	Glassy	Shards, volcanics
	31R-1, 15-17	285.95	Calcareous silty clay	Argillaceous

	180-1116A-
Pliocene	1R-1, 58-60	0.58	Medium- to coarse-grained sandstone	Glassy	Shards, felsites, andesites, trachytes, basalts, gabbros, serpentinites, granites, amphibole schists, talc schists	Shell debris
	2R-CC, 11-14	8.0	Sandy siltstone
	3R-1, 13-15	16.33	Fine-grained sandstone	Carbonatic matrix	Volcanics, basalts, serpentinites, chlorite schists	Shell debris	X, as ribbons
	3R-1, 42-44	16.62
	4R-2, 1-4	25.51	Silty sandstone
	5R-1, 18-20	33.98
	5R-1, 79-81	34.59	Orthoconglomerate	Argillaceous	Andesites, basalts, dolerites, gabbros, limestones
	6R-1, 9-11	42.49	Conglomerate	Carbonatic matrix	Andesites, dolerites, gabbros, serpentinites, Prh-Pmp metabasalts	Benthic foraminifers, algae
	6R-1, 37-39	42.77	Conglomerate	Carbonatic matrix	Andesites, dolerites, gabbros, serpentinites, Prh-Pmp metabasalts
	7R-1, 58-60	48.58	Conglomerate	Carbonatic matrix	Andesites, trachytes, basalts, dolerites, gabbros, cherts
	7R-CC, 5-7	48.67	Silty sandstone	Argillaceous	Andesites
	9R-1, 122.5-126	63.83	Silty sandstone	Carbonatic cement		Foraminifers
	9R-1, 138-141	63.98	Carbonaceous fine-grained sandstone	Carbonatic matrix
	11R-1, 16-19	81.96	Medium-grained sandstone	Argillaceous	Volcanics	Shell debris
	12R-1, 2-6	91.42	Fine-grained sandstone	Argillaceous	Volcanics, serpentine schists, prehnite
	13R-2, 25-27	102.07	Fine-grained sandstone	Glassy	Shards	Shell debris
	13R-4, 51-54	103.55	Fine-grained sandstone	Glassy	Shards	Shell debris
	14R-1, 50-52	111.10	Fine- to medium-grained sandstone	Argillaceous
	16R-1, 103-106	131.03
	16R-1, 103-107	131.03	Fine- to medium-grained sandstone	Argillaceous	Andesites	Foraminifers
	16R-3, 6-8	132.22
	16R-3, 134-136	133.50	Fine-grained sandstone	Glassy, argillaceous	Shards, volcanics	Benthic and planktonic foraminifers	X
	17R-2, 53-55	141.73	Interbedded fine-grained sandstone and siltstone	Cement/argillaceous	Volcanics	Benthic foraminifers
	18R-1, 30-32	149.60	Interbedded fine-grained sandstone and siltstone	Cement/argillaceous	Volcanics	Benthic foraminifers
	18R-2, 11-15	150.32	Interbedded medium-grained sandstone and siltstone	Cement/argillaceous	Volcanics	Benthic foraminifers

Notes: Lithic fragments: gabbro includes olivine gabbro, oxide gabbro, and diorite compositions; basalt and dolerite refer to tholeiitic serial affinity; andesite includes calc-alkaline basalt andesite and andesite to quartz andesite; felsite refers to dacite and rhyolite compositions; trachyte includes lava clasts and glass with K-feldspar microliths; granophyre indicates fine-grained eutectic quartz-feldspar intergrowth; shards include ash fall tephra or prevalent glassy matrix in turbidites; volcanics include fragments of uncertain definition. Prh = prehnite, Pmp = pumpellyite, X = present.