Word: mollusk
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Dates: during 1940-1949
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...Chalk Age of 100,000,000 years ago, when the dinosaurs reached their lurid climax before extinction, there lived in the sea shallows a big mollusk, Inoceramus, with a shell width up to four feet. Inoceramus was not much different from modern oysters, made pearls the same way-surrounding a foreign irritant inside its shell with concentric layers of the calcium-carbon-oxygen compound called nacre...