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The iridium layer
The resistance was strong and reasoned: geology had spent a century ridding itself of catastrophe explanations, and an asteroid looked like a relapse. Confirmation came when the Chicxulub crater in the Yucatán was identified in 1991 — it had been known to oil companies since the 1970s, but nobody had made the connection. The hypothesis now stands as the leading explanation, with Deccan volcanism a contributing factor still argued over.
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