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363 million years ago.

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13y ago
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Horsetails and similar plants, known as fern allies, were dominant during the Carboniferous period around 300 million years ago. They were widespread and played a significant role in shaping ancient ecosystems, contributing to the formation of coal deposits.

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Q: Horsetails and similar plants are thought to have constituted a large proportion of the vegetation during which geological time period?
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