Table T6. Summary of diatom and radiolarian biostratigraphic datums recognized in Holes 1165B and 1165C and calibrated ages for each datum event.

Upper sample   Lower sample Event Taxon Constraint Calibrated
age
(Ma)
Core, section, interval (cm)
Interval depth
(mbsf)
Core, section, interval (cm)
Interval depth
(mbsf)
Diatoms:







188-1165B-,
188-1165B-




1H-2, 20-21 1.70
1H-5, 20-21 6.20 LO Actinocylclus ingens < 0.66
1H-5, 20-21 6.20
2H-2, 95-96 9.25 LO Fragilariopsis barronii > 1.35
2H-2, 95-96 9.25
3H-1, 95-96 17.25 LO Thalassiosira kolbei > 1.8-2.0
3H-1, 95-96 17.25
3H-2, 20-21 18.00 LO Thalassiosira vulnifica > 2.2-2.3
3H-2, 20-21 18.00
3H-3, 20-21 19.50 LO Thalassiosira insigna > 2.5-2.6
3H-CC 25.01
4H-1, 20-21 26.00 FO Thalassiosira vulnifica < 2.8-3.2
5H-1, 127-128 36.57
5H-2, 127-128 38.07 FO Fragilariopsis interfrigidaria < 3.7-3.8
5H-4, 95-96 40.75
5H-5, 60-61 41.90 FO Fragilariopsis barronii < 4.2-4.4
6H-3, 95-96 48.75
6H-4, 59-60 49.89 FO Thalassiosira inura < 4.8-4.9
12H-CC 101.80
13H-6, 70-71 114.50 FO Thalassiosira torokina < 8.5-10.0
23X-3, 20-21 188.30
23X-CC 194.70 LO Denticulopsis dimorpha > 11.0-11.1
27X-CC 231.69
28X-CC 242.68 FO Denticulopsis dimorpha < 12.2-12.8
28X-CC 242.68
30X-CC 253.71 FO Denticulopsis praedimorpha < 12.8-13.1
35X-CC 298.38
36X-CC 309.52 FCO Denticulopsis simonsenii < 14.1-14.6
38X-CC 327.78
39X-CC 336.89 FO Actinocyclus ingens v. nodus < 14.5-14.7
50X-CC 443.99
51X-CC 449.80 FCO Actinocyclus ingens < 15.9-16.4
55X-CC 487.52
56X-CC 495.81 FO Denticulopsis maccollumii < 16.7-17.0
55X-CC 487.52
56X-CC 495.81 FO Crucidenticula kanayae < 17.5-17.7
59X-CC 527.92
60X-CC 534.60 LO Thalassiosira praefraga > 18.3-19.1
188-1165C-

188-1165C-




10R-3, 127-129 750.77
— — FO Thalassiosira praefraga < 19.9-20.8
Radiolarians:







188-1165B-

188-1165B-




3H-CC 25.01
4H-CC 35.75 LO Prunopyle titan > 3.5
4H-CC 35.75
5H-CC 44.08 FO Helotholus vema < 4.57
6H-CC 54.39
1R-CC 63.60 LCO Lychnocanoma grande > 5.03
11H-CC 100.32
12H-CC 101.80 FO Acrosphaera? labrata < 7.71
12H-CC 101.80
13H-CC 116.02 LO Cycladophora spongothorax > 9.12
15H-CC 128.58
16H-CC 135.03 FCO Ceratocyrtis stigi < 9.32
21X-CC 172.67
22X-CC 185.08 FO Acrosphaera australis < 10.36
21X-CC 172.67
22X-CC 185.08 LO Cycladophora humerus > 10.53
23X-CC 194.70
24X-CC 199.15 LO Actinonomma golownini > 10.77
38X-CC 327.78
39X-CC 336.89 FO Cycladophora spongothorax < 12.55
38X-CC 327.78
39X-CC 336.89 FO Cycladophora humerus < 14.18
54X-CC 479.50
55X-CC 487.52 FO Cycladophora golli regipileus < 19.11

Notes: Sample designations and depths in bold type represent the occurrence of each taxon, and plain type represents sample-spacing uncertainty for each datum. LO = last occurrence, FO = first occurrence, FCO = first common occurrence, LCO = last common occurrence. — = not identified due to opal-A dissolution.