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Table T9. Radiolarian datums, Site U1331. (See table note.)

Geologic age Zone Marker species Age
(Ma)		 Core, section, interval (cm) Depth CSF (m)
Top Bottom Top Bottom Midpoint ±
upper Oligocene RP21     320-U1331A- 320-U1331A-
B T. annosa 28.33 2H-2, 104–106 2H-4, 104–106 7.75 10.75 9.25 1.50
lower Oligocene   T. triceros > D. ateuchus 28.60 2H-4, 104–106 2H-CC 10.75 14.81 12.78 2.03
RP20 B D. ateuchus 29.50 2H-4, 104–106 2H-CC 10.75 14.81 12.78 2.03
B D. circulus 29.96 2H-CC 3H-3, 126–128 14.81 18.97 16.89 2.08
T L. crux 30.13 2H-CC 3H-3, 126–128 14.81 18.97 16.89 2.08
B E. plesiodiaphanes 30.57 2H-CC 3H-3, 126–128 14.81 18.97 16.89 2.08
B L. pegetrum 30.68 2H-CC 3H-3, 126–128 14.81 18.97 16.89 2.08
T L. oberhaensliae 30.74 3H-3, 126–129 3H-5, 121–124 18.97 21.92 20.45 1.48
B D. spinosa 30.84 3H-3, 126–129 3H-5, 121–124 18.97 21.92 20.45 1.48
T D. pseudopaplilio 30.84 3H-3, 126–129 3H-5, 121–124 18.97 21.92 20.45 1.48
T C. gravida 30.89 3H-5, 121–124 3H-CC 21.92 24.12 23.02 1.10
B T. tuberosa 31.00 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
B D. pseudopaplilio 31.00 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
B C. gravida 31.01 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
B L. crux 31.01 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
T C. anekathen 33.65 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
T L. jacchia 33.69 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
T D. armadillo 33.69 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
T L. amphitrite 33.75 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
  L. aristotelis > L. angusta 33.82 3H-CC 4H-2, 104–106 24.12 26.75 25.44 1.31
upper Eocene RP19 B L. angusta 34.13 4H-2, 104–106 4H-4, 104–106 26.75 29.75 28.25 1.50
T C. bandyca 34.62 4H-2, 104–106 4H-4, 104–106 26.75 29.75 28.25 1.50
  T T. tetracantha 35.30 4H-4, 104–106 4H-CC 29.75 33.95 31.85 2.10
RP18 B L. hadra 35.34 4H-CC 5H-2, 104–106 33.95 36.25 35.10 1.15
T L. turgidum 35.77 4H-CC 5H-2, 104–106 33.95 36.25 35.10 1.15
T L. amphitrite 36.50 5H-4, 104–106 5H-CC 39.25 42.77 41.01 1.76
  B C. bandyca 36.74 5H-4, 104–106 5H-CC 39.25 42.77 41.01 1.76
RP17 B L. jacchia 37.07 5H-4, 104–106 5H-CC 39.25 42.77 41.01 1.76
middle Eocene B T. lochites 37.52 6H-2, 105–107 6H-4, 105–107 45.75 48.75 47.25 1.50
  B C. azyx 37.52 6H-2, 105–107 6H-4, 105–107 45.75 48.75 47.25 1.50
RP16 T Anthocyrtoma spp. 37.92 6H-4, 105–107 6H-CC 48.75 52.46 50.61 1.85
B T. bromia 38.07 6H-4, 105–107 6H-CC 48.75 52.46 50.61 1.85
B T. tetracantha 38.12 6H-4, 105–107 6H-CC 48.75 52.46 50.61 1.85
T D. anastasis 38.45 6H-CC 7H-2, 95–97 52.46 55.16 53.81 1.35
B C. turris 38.67 6H-CC 7H-2, 95–97 52.46 55.16 53.81 1.35
B L. aristotelis gr. 39.73 7H-2, 95–97 7H-4, 95–97 55.16 58.16 56.66 1.50
B D. anastasis 39.98 7H-4, 95–97 7H-CC 58.16 62.49 60.33 2.17
  B P. goetheana 40.16 7H-4, 95–97 7H-CC 58.16 62.49 60.33 2.17
RP15 T L. biaurita 40.36 8H-4,104–106 8H-CC 67.75 72 69.88 2.13
  P. mitra > P. chalara 40.70 9H-4,105–107 9H-CC 77.26 81.47 79.37 2.10
RP14 T P. trachodes 41.23 10H-2, 95–97 10H-4, 95–97 83.66 86.66 85.16 1.50
B P. chalara 41.54 10H-4, 95–97 10H-CC 86.66 90.29 88.48 1.82
B C. ornatum 42.10 10H-CC 11H-3, 106–108 90.29 93.95 92.12 1.83
B S. triconiscus 42.40 11H-3, 106–108 11H-5, 106–108 93.95 96.95 95.45 1.50
T E. lagena 42.69 11H-5, 106–108 11H-CC 96.95 99.32 98.14 1.19
B T. perpumila 42.97 11H-CC 12H-2, 106–108 99.32 102.77 101.05 1.73
T P. helenae 43.05 12H-2, 106–108 12H-4, 106–108 102.77 105.77 104.27 1.50
B P. trachodes 43.22 12H-4, 106–108 12H-CC 105.77 109.99 107.88 2.11
B Z. cimelium 43.35 12H-4, 106–108 12H-CC 105.77 109.99 107.88 2.11
  P. sinuosa > P. mitra 43.84 13H-2, 104–106 13H-4, 104–106 112.25 115.25 113.75 1.50
RP13 B P. helenae 44.15 13H-4, 104–106 13H-CC 115.25 119.38 117.32 2.06
T P. phyxis 44.44 13H-CC 14H-2, 104–106 119.38 121.72 120.55 1.17
  P. phyxis > P. ampla 44.77 14H-2, 104–106 14H-4, 104–106 121.72 124.72 123.22 1.50
RP12 T T. venezuelensis 45.16 14H-4, 104–106 14H-CC 124.72 128.58 126.65 1.93
T T. anaclasta 45.62 14H-CC 15H-2, 94–96 128.58 131.15 129.87 1.28
T T. cryptocephala 46.01 15H-2, 94–96 15H-4, 94–96 131.15 134.15 132.65 1.50
B T. orthotenes 46.16 15H-CC 16X-1, 50–52 138.47 139.71 139.09 0.62
T T. hirsuta 46.19 15H-CC 16X-1, 50–52 138.47 138.71 138.59 0.12
B P. phyxis 46.44 16X-1, 50–52 16X-CC 138.71 139.27 138.99 0.28
B R. ornatum 47.42 16X-CC 17X-2, 104–106 139.27 150.15 144.71 5.44
B T. triacantha 47.42 16X-CC 17X-2, 104–106 139.27 150.15 144.71 5.44
  B E. lagena 47.42 16X-CC 17X-2, 104–106 139.27 150.15 144.71 5.44
RP11 T P. striata striata 48.14 17X-4, 104–106 19X-CC 153.15 162.1 157.63 4.47
  B D. mongolfieri 48.50 19X-2, 25–27 19X-CC 161.75 162.1 161.93 0.17
RP10 T. nigriniae > T. cryptocephala 49.00 19X-CC 20X-CC 162.1 167.02 164.56 2.46

Note: B = bottom, T = top.

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