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志留纪是早古生代最后的一个时代，距今4.3亿年。这时期由于猛烈的造山运动，海洋面积缩小了。陆地生成并逐渐扩大。气候转暖形成的浅海引发了生物进化的高潮。低等微管束植物作为真正意义上的植物，已经登陆成功。沼泽地里长出了脚踝高的“丛林”。伴随着陆生植物的发展，志留
Silurian was the last era of the Early Paleozoic era, 430 million years ago. During this period, due to the violent orogeny, the area of the ocean has shrunk. Land is generated and gradually expanded. The shallow sea formed by the warming of the climate has triggered the climax of biological evolution. Low-level microtubule plants have been successfully landed as true plants. In the marsh, there is a high-footed “jungle.” With the development of landing plants, Shiliu