到了3亿年前，大片的森林和沼泽覆盖了陆地，最早的爬虫类化石也发现在这一时期的地层中。
By 300 million years ago, large forests and swamps covered the land, and the earliest fossils of reptiles appear during this period as well.
到了3亿年前，大片的森林和沼泽覆盖了陆地，最早的爬虫类化石也发现在这一时期的地层中。
By 300 million years ago, large forests and swamps covered the land, and the earliest fossils of reptiles appear during this period as well.
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