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In page Jurassic:

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The arid, continental conditions characteristic of the Triassic steadily eased during the Jurassic period, especially at higher latitudes; the warm, humid climate allowed lush jungles to cover much of the landscape.[1] Gymnosperms were relatively diverse during the Jurassic period.[2] The Conifers in particular dominated the flora, as during the Triassic; they were the most diverse group and constituted the majority of large trees.