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Quartz geode Unopened 12cm M3256
The Silurian is a geologic period that lasted from 443 to 419 million years ago. Many molluscs, including gastropods, bryozoa, brachiopods and jawless fishes roamed the Earth. First land plants and land animals.
Position of the Silurian in the geological timescale
See also the article about the Geological Timescale.
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