Source: Jessica Winder Oyster shells have rings, much like tree rings, which give clues about oyster growth and age. environmental clues - cold winters with slow growth and a dense age ring, warm summers with faster growth and a less dense ring) to determine the age of the oyster.
For example: in the image, one thick, darker section and one thinner, white line would represent one year of growth - a summer growing season and a winter growing season.
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The mineral content in oyster shells also reflect mineral content of the ocean.
Scientists can use fossil oyster shells to examine historic ocean conditions.
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