Studied samples show evidence of Ir anomaly, by an average of fifty times enrichment in iridium compared to present day ocean crust. Ir anomalies are often considered unique indicators for cosmic events. Chondritic meteorites are rich in trace elements such as Ir, Se, Ni, Co and Cr compared to the means of earth’s crust. Consequently, high concentration of these metallic elements, especially Ir in sedimentary layers has been reported of indication the meteorite impact at the sedimentation time

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