(Table 1) Strontium isotope data for marine barnacles, ODP Hole 178-1103A

Strontium isotope ratios from multiple plates of two barnacle fragments from Site 1103 (Ocean Drilling Program Leg 178) provide maximum age estimates for the oldest glacial sedimentary package drilled. Three moderately preserved barnacle fragments from 262.63 meters below seafloor (mbsf) yielded a mean best-fit age of 7.4 Ma. A single, well-preserved fragment from the same horizon yielded a best-fit age of 12.2 Ma. Two moderately preserved fragments from 262.98 mbsf yielded a mean best-fit age of 7.8 Ma. The calculated mean strontium ages of 7.8 and 7.4 Ma agree well with the diatom estimates of 8.68 to 5.89 Ma for the underlying sediments.

来自海洋钻探计划第178航次在1103号地点采集的两个海螺碎片的多块板上的锶同位素比值，为最古老的冰川沉积岩层的最大年龄提供了估算。来自海底下方262.63米处的三个中等保存状态的海螺碎片产生了平均最佳拟合年龄为7.4百万年。同一层位的一个完好保存的碎片产生了最佳拟合年龄为12.2百万年。来自海底下方262.98米处的两个中等保存状态的碎片产生了平均最佳拟合年龄为7.8百万年。计算出的7.8和7.4百万年的锶平均年龄与底层沉积物的硅藻估计年龄8.68至5.89百万年相吻合。