From Wikipedia, the free encyclopedia
Séard é an prótarasóch ná an dara haois de dhá aois gheolaíocha ina roinntear an ré Réamh-Chaimbriach, ó timpeall 2,500 milliún bliain ó shin go dtí tús na ré Caimbriach timpeall 590 milliún bliain ó shin.[1]
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