Table T2. Calcareous nannofossil datums, Holes 1220A and 1220B.
Core, section,
interval (cm)
Marker species
Age
(Ma)
Depth (mbsf)
Depth (mcd)
Top
Bottom
Midpoint
±
Midpoint
±
199-1220A- 199-1220A-





3H-5, 60 3H-6, 40 T Triquetrorhabdulus carinatus acme 22.9 25.70 0.65 25.70 0.65
5H-1, 60 5H-1, 140 B Sphenolithus ciperoensis 28.1 39.00 0.40 42.29 0.40
5H-4, 60 5H-5, 45 T Sphenolithus pseudoradians 29.1 43.78 0.68 47.07 0.68
6H-3, 100 6H-4, 80 B Sphenolithus distentus 30.4 52.15 0.65 57.49 0.65
7H-4, 70 7H-4, 140 T Reticulofenestra umbilicus 14 µm 31.7 62.51 0.35 68.82 0.35








199-1220B- 199-1220B-





3H-1, 60 3H-1, 90 B Sphenolithus distentus 30.4 53.75 0.15 57.14 0.15
4H-3, 60 4H-3, 100 T Ericsonia formosa 32.9 68.30 0.20 73.69 0.20
18X-3, 120 18X-3, 145 X Tribrachiatus contortus/T. orthostylus 53.4 191.55 0.13 210.26 0.13
19X-CC 20X-1, 20 B Tribrachiatus bramlettei 53.9 195.67 1.94 214.38 1.94
20X-1, 90 20X-1, 115 T Fascicultihus spp.* 54.1 198.43 0.13 217.14 0.13
20X-1, 105 20X-1, 115 X Fascicultihus/Rhomboaster* 54.1 198.50 0.05 217.21 0.05
20X-1, 125 20X-2, 1 B Rhomboaster spp.* 54.1 198.78 0.13 217.49 0.13

Notes: T = top, B = bottom, X = abundance cross-over. * = age estimates in need of revision; events occur 0.77-1.38 m above the Paleocene/Eocene boundary (199-1220B-20X-2, 78 cm). This table is also available in ASCII. [N1]