![](_themes/expeditn/expbul1a.gif) | beginning of closure of the Iapetus Ocean
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![](_themes/expeditn/expbul1a.gif) | the collision of Avalonia with Baltica
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![](_themes/expeditn/expbul1a.gif) | widening of the Rheic Ocean between Baltica and
Gondwana
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![](_themes/expeditn/expbul1a.gif) | continued subduction along northern margin of
Gondwana
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![](_themes/expeditn/expbul1a.gif) | subduction of the Panthalassic Ocean beneath
Laurentia and Siberia
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