The scientists have detected the unexpected accumulation of Beryllium-10 in the samples collected from the Pacific seabed.
Beryllium-10 is a rare radioactive isotope produced by the cosmic rays in the atmosphere that can provide valuable insights into the Earth's geological history.
The radiocarbon is dating which is limited to samples younger than 50,000 years.
Beryllium-10 has a half-life of 1.4 million years.
So, it is allowing it to be used for dating geological events over millions of years.