Table T7. Summary of biohorizons at Site 1146.

Code Events Depth range of stratigraphic datums Average depth (mcd) Age
(Ma)		 Average sedimentation rate
(m/m.y.)
Top
Bottom
Core, section,
interval (cm)		 Depth
(mbsf)		 Depth
(mcd)
Core, section,
interval (cm)		 Depth (mbsf) Depth (mcd)


184-1146A-


184-1146A-




CN FO E. huxleyi acme 2H-CC, 12-19 13.30 14.25
3H-CC, 13-20 23.14 24.79 19.52 0.09
192.7
PF LO pink G. ruber 3H-CC, 13-20 23.14 24.79
4H-CC, 21-28 32.53 35.13 29.96 0.12
CN FO E. huxleyi 7H-CC, 36-43 61.36 63.86
8H-CC, 0-7 70.10 73.10 68.48 0.26
PF FO pink G. ruber 7H-CC, 36-43 61.36 63.86
8H-CC, 0-7 70.10 73.10 68.48 0.40
CN LO P. lacunosa* 9H-CC, 26-33 80.26 83.86
10H-CC, 26-31 89.60 93.40 88.63 0.46
BF LO Stilostomella 10H-CC, 26-31 89.60 93.40
11H-CC, 44-50 99.50 104.85 99.12 0.75
60.4
CN LO R.asanoi 12H-CC, 26-32 108.60 114.40
13H-CC, 22-28 118.33 124.83 119.62 0.83
CN FO R. asanoi 14H-CC, 20-26 127.67 135.02
15H-CC, 25-32 137.32 145.52 140.27 1.16
CN LO C. macintyrei 17H-CC, 32-38 155.75 166.10
18H-CC, 24-29 165.44 175.49 170.79 1.59
PF LO G. fistulosus 17H-CC, 32-38 155.75 166.10
18H-CC, 24-29 165.44 175.49 170.79 1.77
CN LO D. brouweri 19H-CC, 20-26 175.31 185.46
20H-CC, 25-32 184.71 195.14 190.30 1.95
PF FO G. truncatulinoides 19H-CC, 20-26 175.31 185.46
20H-CC, 25-32 184.71 195.14 190.30 2.00
PF LO G. multicamerata 20H-CC, 25-32 184.71 195.14
21H-CC, 0-5 193.80 206.15 200.64 2.40
CN LO D. pentaradiatus 21H-CC, 0-5 193.80 206.15
22X-CC, 30-35 203.65 216.70 211.42 2.52
CN LO D. tamalis* 23X-CC, 22-27 212.78 226.68
24X-CC, 28-33 222.37 237.07 231.87 2.83



   
184-1146C-         28.7
PF LO G. altispira 24X-CC, 28-33 222.37 237.07
24X-CC, 24-31 233.79 245.84 241.47 3.09
PF LO S. seminulina 24X-CC, 28-33 222.37 237.07
24X-CC, 24-31 233.79 245.84 241.47 3.12













184-1146B-    
184-1146B-        
CN LO Sphenolithus spp. 24X-CC, 27-34 226.03 241.78
25X-CC, 13-21 235.39 250.54 246.20 3.66













184-1146C-    
184-1146C-        
PF FO G. tosaensis 24X-CC, 24-31 233.79 245.84
25X-CC, 20-27 243.46 255.01 250.46 3.35













184-1146A-    
184-1146A-        
CN LO R. pseudoumbilicus 26X-CC, 35-41 241.95 256.50
27X-CC, 23-30 251.37 267.47 262.02 3.82
PF LO G. margaritae 26X-CC, 35-41 241.95 256.50
27X-CC, 23-30 251.37 267.47 262.02 3.58
PF Pullenitina coiling change 26X-CC, 35-41 241.95 256.50
27X-CC, 23-30 251.37 267.47 262.02 3.95
PF LO G. nepenthes 27X-CC, 23-30 251.37 267.47
28X-CC, 16-23 260.99 278.63 273.08 4.20
CN LO Amaurolithus spp. 28X-CC, 16-23 260.99 278.63
29X-CC, 16-23 270.40 288.50 283.60 4.8
CN LO C. acutus 29X-CC, 16-23 270.40 288.50
30X-CC, 37-44 280.26 298.71 293.64 4.99
CN LO T. rugosus 30X-CC, 37-44 280.26 298.71
31X-CC, 23-30 289.94 308.39 303.58 5.23
CN LO D. quinqueramus 31X-CC, 23-30 289.94 308.39
32X-CC, 38-45 299.51 317.96 313.21 5.54
CN LO A. amplificus 33X-CC, 15-22 309.07 327.82
34X-CC, 24-30 318.81 337.76 332.82 5.99
PF FO S. dehiscens 34X-CC, 23-30 318.81 337.76
35X-CC, 17-24 328.33 348.03 342.93 5.54
PF FO G. tumida 35X-CC, 17-24 328.33 348.03   36X-CC, 37-44 338.24 360.34 354.22 5.82
CN FO A. amplificus 35X-CC, 17-24 328.33 348.03   36X-CC, 37-44 338.24 360.34 354.22 6.76
PF FO G. conglobatus 36X-CC, 37-44 338.24 360.34   37X-CC, 35-41 347.95 370.70 365.55 6.20
CN FO A. primus 36X-CC, 37-44 338.24 360.34   37X-CC, 35-41 347.95 370.70 365.55 7.39
CN FO D. berggrenii 39X-CC, 24-31 367.02 390.82   40X-CC, 35-42 376.66 401.46 396.17 8.20
PF FO G. plesiotumida 40X-CC, 35-42 376.66 401.46   41X-CC, 24-31 386.26 411.88 406.70 8.58
PF FO G. extremus 40X-CC, 35-42 376.66 401.46   41X-CC, 24-31 386.26 411.88 406.70 8.58
CN FO D. pentaradiatus 40X-CC, 35-42 376.66 401.46   41X-CC, 24-31 386.26 411.88 406.70 8.55
CN LO D. hamatus 41X-CC, 24-31 386.26 411.88
42X-CC, 28-35 395.50 419.82 415.88 9.40
PF FO N. acostaensis 42X-CC, 28-35 395.50 419.82
43X-CC, 33-40 405.07 429.54 424.71 9.82
CN FO D. hamatus 44X-CC, 44-50 414.57 438.64
45X-CC, 33-39 424.71 449.13 443.92 10.38
PF LO G. mayeri 44X-CC, 44-50 414.57 438.64
45X-CC, 33-39 424.71 449.13 443.92 10.49
CN FO C. coalithus 45X-CC, 33-39 424.71 449.13
46X-CC, 55-61 434.46 460.38 454.79 10.79
CN LO D. kugleri 46X-CC, 55-61 434.46 460.38
47X-CC, 46-52 443.96 471.88 466.16 11.52
PF FO G. nepenthes 46X-CC, 55-61 434.46 460.38
47X-CC, 46-52 443.96 471.88 466.16 11.19
CN FO D. kugleri 48X-CC, 37-42 453.57 481.78
49X-CC, 37-44 463.10 490.24 486.04 11.83
PF LO F. fohsi s.l.* 48X-CC, 37-42 453.57 481.78
49X-CC, 37-44 463.10 490.24 486.04 11.68
CN FO T. rugosus 49X-CC, 37-44 463.10 490.24
50X-CC, 31-38 472.67 499.36 494.83 12.62
14.5
CN LO C. floriganus 50X-CC, 31-38 472.67 499.36
51X-CC, 32-39 482.13 509.32 504.37 13.19
PF FO F. fohsi s.l. 50X-CC, 31-38 472.67 499.36
51X-CC, 32-39 482.13 509.32 504.37 13.42
CN LO S. heteromorphus 51X-CC, 32-39 482.13 509.32
52X-CC, 37-43 491.80 520.24 514.81 13.57
PF FO F. praefohsi 51X-CC, 32-39 482.13 509.32
52X-CC, 37-43 491.80 520.24 514.81 14.00
PF FO F. peripheroacuta 52X-CC, 37-43 491.80 520.24
53X-CC, 24-32 501.31 531.20 525.76 14.80
PF FO O. universa* 53X-CC, 24-32 501.31 531.20
54X-CC, 27-34 509.37 540.11 535.69 15.10
CN LO H. ampliaperta 54X-CC, 27-34 509.37 540.11
55X-CC, 35-42 520.68 551.32 545.75 15.60 38.1
CN LO D. deflandrei acme 57X-CC, 34-41 539.80 574.30
58X-CC, 24-31 549.26 585.13 579.75 16.20
PF FO P. sicana 59X-CC, 34-41 558.94 594.67
60X-CC, 27-34 568.53 604.63 599.68 16.40
PF LO C. dissimilis* 61X-CC, 43-50 578.22 614.21
62X-CC, 19-26 587.47 624.26 619.62 17.30
CN FO S. heteromorphus 63X-3, 70 591.30 627.64
63X-CC, 33-39 597.39 633.73 630.70 18.20 19.6
CN LO S. belemnos* 64X-2, 66 599.36 635.35
64X-CC, 35-41 607.09 643.08 639.20 18.30
PF LO G. binaiensis 63X-CC, 33-39 597.39 633.73
64X-CC, 35-41 607.09 643.08 638.41 19.10

Notes: Sources of reference age for all biostratigraphic events are listed in Tables T2 and T3, both in the "Explanatory Notes" chapter. CN = calcareous nannofossils, PF = planktonic foraminifers, BF = benthic foraminifers, FO = first occurrence, LO = last occurrence. * = events used in calculating average sedimentation rate. Depth for the top and bottom of biostratigraphic events = the mean of the sample interval. Depth in bold indicates where datum is recorded; depth range between the top and bottom is the interval where the real bioevent may occur. Bars in average sedimentation rate column indicate the range of samples to which the average sedimentation rate applies.