...一叶部化石还尚无可靠的论据确认为银杏纲(Ginkgopsida)植物,但其形态和银杏(Ginkgo)相似,有人认为可以归属于银杏类(Ginkgophytes)。已知真正的银杏纲(Ginkgopsida)植物发现于早二叠纪至现在,主要繁盛于中生代,
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分为四个不同的类群：苏铁类、银杏类、 松柏类、买麻藤类植物以及一些化石类群。
There are four widely different living groups : the cycads, ginkgo, conifers, gnetophytes, and several fossil groups.
吉林南部杉松岗盆地早侏罗世植物群主要由松柏类、银杏类、真蕨类和茨康类组成，迄今已发现22属37种。
More than 37 species of 22 genera of fossil plants are recognized by the authors from the Shansonggang Basin of southern Jilin, China, including mainly conifers, ginkgoales, ferns and czekanowskiales.
另一方面，落叶的银杏类和松柏类，以及裸子植物木化石中具有清楚的生长轮，又说明该地区的古气候存在着季节变化。
On the other hand, some deciduous gymnosperms including Ginkgoales, and the presence of growth rings in the fossil secondary wood, indicate seasonal changes.
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