(Table 2) Magnetic reversal boundaries identified in ODP Hole 104-642B

2.92 Ma = C2AN-1/C2AR-1 > hiatus > C2AR-1/C2AN-2 = 2.99 Ma. 6.37 Ma = C3AR-2/C3BN > 2 hiatuses; small badly disturbed recovery in Core 14; unresolved very predominantly normal polarity sequence in Cores 15 through 20 > C5AR-4/C5AN-5 = 12.83 Ma.2.92 Ma对应C2AN-1/C2AR-1，其间存在沉积间断（hiatus），直至C2AR-1/C2AN-2，对应年龄为2.99 Ma。6.37 Ma对应C3AR-2/C3BN，其间存在两处沉积间断；14号岩芯中仅获取到少量受严重扰动的岩芯样品，回收效果欠佳；15至20号岩芯中存在未明确厘定的以正极性为主的地磁极性序列，该序列对应节点C5AR-4/C5AN-5的年龄为12.83 Ma。