iridium anomaly

thin layer of the element iridium in rock strata at the Cretaceous–Paleogene boundary

en-GB/ɪˈɹɪdɪəm əˈnɒməˌlɪ/
en-US/ˌɪˈɹɪdiəm əˈnɑməli/

دسته بندی ها:

physical phenomenon