Dinosaur, The asteroid theory
The discovery of an abnormally high concentration of the rare metal iridium at, or very close to, the K - T boundary provides what has been recognized as one of those rare instantaneous geologic time markers that seem to be worldwide. This iridium anomaly, or spike, was first found by Walter Alvarez in the Cretaceous - Tertiary stratigraphic sequence at Gubbio, Italy,
posted by TiredKnife @ 10:32 PM
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