The evidence of the impact was unearthed in a portion of the sediments that originated on the ocean floor. These ocean sediments were then preserved between two layers of volcanic sediments that could be dated with a high degree of precision, allowing the scientists to determine exactly when the impact occurred. While glass spherules are often a sign of an impact, the team found that the levels of platinum, chromium and nickel found in the spherules were very similar to those found inside asteroids.
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