Did Dusty Skies Doom the Dinosaurs?

Fine particles kicked up by the Chicxulub asteroid impact could have blocked out the Sun for years, resulting in global cooling and disastrous consequences for ecosystems

Dust might have been responsible for the deadly dinosaur-killing global winter that came after an asteroid slammed into Earth 66 million years ago, finds a study published on 30 October in Nature Geoscience.

The researchers looked at a well-preserved sample of rock formed at the time of extinction event in what is now North Dakota. Such rocks contain traces that geoscientists use to mark the change from the Cretaceous period to the Palaeogene period in Earth’s history. They looked at the amounts of sulfur, soot and minerals called silicates in the sample, and found that the sample contained many more small, fine particles of silicate dust — ranging from about 0.8 to 8.

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