Talk:Iridium anomaly

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Amount vs Isotope[edit]

Uhh, isn't the most important suggestion of the "extraterrestrialness" of the Iridium layer not that it contains 100X more Iridium than "normal"; but rather, that it contains a significantly different distribution of isotopes [than normal]? 124.183.93.28 (talk) 11:09, 14 September 2012 (UTC)