Geology: ke revisions ke biich ke antar

[[File:Ordovicium-Silurian.jpg|thumb|300px|Photo of the [[Ordovician]] – [[Silurian]] boundary, an example of [[marine]] transgression as exposed on the Southern tip of the Hovedøya island, [[Norway]]. Due to the folding of the Caledonian mountain range, the layers have been inverted, leaving Ordovician granular [[limestone]] on top of the later Silurian brownish [[mudstone]].]]

 

 

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