Initial Reports, Volume 199 Ms 199-113 Chapter 13, Table T11. Nannofossil, foraminifer, and radiolarian events, Site 1220. Notes: * = based on Cande and Kent (1995) timescale, 900 k.y. subtracted from age estimates for T. carinatus acme. 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). Marker species/Zonal boundaries Age (Ma) Depth (mcd) plus/minus (m) Nannofossil events: T Triquetrorhabdulus carinatus acme* 22.00 25.75 0.65 B Sphenolithus ciperoensis 28.10 42.29 0.40 T Sphenolithus pseudoradians 29.10 47.07 0.67 B Sphenolithus distentus 30.40 57.49 0.65 T Reticulofenestra umbilicus greater than or equal to 14 micrometer 31.70 68.82 0.35 T Ericsonia formosa 32.90 73.69 0.20 X Tribrachiatus contortus / T. orthostylus 53.40 210.26 0.13 B Tribrachiatus bramlettei 53.80 214.38 1.94 T Fascicultihus spp.** 54.10 217.14 0.13 X Fascicultihus / Rhomboaster** 217.21 0.05 B Rhomboaster spp.** 54.10 217.49 0.13 Marker species/Zonal boundaries Age (Ma) Depth (mcd) plus/minus (m) Foraminifer events: Benthic extinction event 55.00 218.39 0.01 Marker species/Zonal boundaries Age (Ma) Depth (mcd) plus/minus (m) Radiolarian events: RN1/RP22 23.62 24.40 0.50 RP22/21 24.60 33.45 0.75 RP21/20 28.80 52.29 1.00 RP20/19 32.80 76.72 0.88 RP19/18 34.90 82.85 0.75 RP18/17 36.40 93.19 0.75 RP17/16 37.70 100.52 0.75 RP16/15 38.80 114.19 0.32 RP15/14 39.50 125.60 0.22 RP14/13 42.80 138.27 0.75 RP13/12 44.50 149.39 0.75 RP12/11 47.50 160.10 1.85 RP11/10 48.50 183.34 5.47 RP10/9 49.00 RP9/8 50.30 183.34 5.47 RP8/7 52.80 202.98 5.23