Shaw Bishop, an astrophysicist, made an attempt to locate supernovae evidence in the most unlikely place, the sea bed. But his efforts paid off as documented in the paper Proceedings of the National Academy of Science. Bishop wrote that fossil record of supernovae at the sea bottom.
To be specific, Bishop was in search of isotope-60 that was produced after the supernovae blasted out in space. His theory was that the iron-60 particles oxidized and as they passed through Earth’s atmosphere they became dust and settled at the sea floor.
To put that hypothesis to test, Bishop examined sediment core samples using accelerator mass spectrometry upon which he found iron-60 atoms. He then proceeded to compare the concentrations from various samples and thus concluded that he found evidence of supernovae that happened 2.2 million years ago.
A separate study led by Wallner Anton from Australian National University arrived at the same conclusions which they published in the Journal Nature. Their research had found a rough period in Earth’s history where nearby explosions were the nature of the day. In addition, the research makes the hypothesis that the supernovae occurrences led to ice ages Pleistocene about 2.5 million years ago.