The end of the devonian was a crucial time for vertebrates .

泥盆纪末期是脊椎动物出现很的关键时期。

Shale beneath the overhanging devonian sandstone has weathered deeper back into the cliff , accounting for the photogenic nature of these falls .

在悬垂泥盆系砂石岩礁之下的页岩已经风化得比较深而回进了悬崖绝壁，这样就为这些瀑布适合于摄影说明了原因。

Heat generated from the farallon plate subducting below the north american plate led to the creation of an island arc of volcanoes on the west coast of proto-north america between the late devonian and permian periods .

泥盆纪晚期和二叠纪时期之间，隐没在北美板块下面的法拉龙板块产生的热导致了原北美西海岸的火山岛弧的产生。

385 Million b.c. during the middle devonian period of the paleozoic era , a prehistoric fern adds a new growth ring to its trunk , creating the world 's first timeline .

公元前3.85亿年在古生代的泥盆纪中期，一棵史前蕨类在其树干上又加了一圈年轮，建立了世界上第一个时间表。