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Fossils
Fishing out temperature
Issue Date: Jan 31, 1993
SCIENTISTS from the University of Michigan in the US have discovered that stony lumps of calcium carbonate, known as otoliths, found in the ears of most fishes, can offer clues to seasonal temperatures thousands or even millions of years ago (Science, Vol 258 No 5085).
The finding has given a new turn to the old method of tracking ancient climate by analysing oxygen isotopes in tiny fossils from seafloor sediments.
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