A ROCK layer in western Cuba contains the best evidence of an asteroid impact
that may have killed the dinosaurs. The 300-metre thick deposit is the thickest
known from the collision in the Gulf of Mexico, said S. Kiyokawa of the National
Science Museum in Tokyo at the Lunar and Planetary Science Conference in Houston
last week. American geologists suggested looking in Cuba as long ago as 1990,
but travel restrictions prevented them from conducting the fieldwork.
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