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There are other iridium anomalies, particularly the Devonian-Carboniferous boundary (D-C boundary), about 350 Ma ago. The K-Pg boundary is only 66 Ma old. Just because there is an iridium anomaly doesn't mean it was due to a meteorite impact. One of the differences between the K-Pg boundary and the D-C boundary is the D-C boundary lacks shocked quartz, which ...

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