?尼格期
阿仑尼格期(Arenig)是奥陶纪腕足动物群宏演化历史中的关键时期,在此时期腕足动物发生了奥陶纪以来的第一次多样性快速增加事件,丰度和分异度均
中奥陶世Arenig
阿伦尼克统
The B4391 between Ffestiniog and Arenig, and the B4417 at Llithfaen in Gwynedd are also closed, as is the A4212 at Trawsfynydd has also been shut by snow.
BBC: Wales snow: Roads closed as weather moves to north Wales
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