Pleistocene Planktic Foraminiferal Events in the Northwest Pacific Near Japan

Table 1: Magnetostratigraphic and Tephrostratigraphic Control Points and Estimated Ages of Planktic Foraminiferal Events in the Uppermost Pliocene to Pleistocene Sequence of Site 1150.

Events ^a	Depth (mbsf) ^b	Age (Ma) ^c	Previous Estimate (Ma) ^d
Aso-4 tephra	26.80-26.82	0.09
LO Neogloboquadrina inglei	66.57/72.55	0.73 ± 0.05	0.712 ± 0.021
B C1n (B Brunhes)	72.91	0.78
T C1r.1n (T Jaramillo)	93.03	0.99
B C1r.1n (B Jaramillo)	96.445	1.07
FO Neogloboquadrina pachyderma	104.55/108.72	1.25 ± 0.04	1.232 ± 0.018 ^e
LO Neogloboquadrina asanoi	129.40/136.00	1.71 ± 0.06	2.216 ± 0.015
B C2n (B Olduvai)	146.43	1.95

^a For biostratigraphic data, LO = last occurrence, FO = first occurrence. Magnetostratigraphic and tephrostratigraphic horizons [2, 4] are shown in bold.

^b Meters below the seafloor.

^c The age error of the bioevents due to sampling frequency was calculated as one-half the difference in the ages of the two samples between which the event occurred.

^d From Kucera and Kennett [1].

^e For the FO of N. pachyderma B.