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Unformatted text preview: to the east and Siberia to the north. Gondwana remained as a large southern hemisphere landmass, although there is no evidence of glaciation there during the Silurian. The collision of Baltica and North America caused mountain building (what geologists refer to as the Caledonian orogeny) along with the closing of the ancient Iapetus ocean. Between Baltica and Gondwana, however, a new ocean, Tethys, began to form. The end of the Silurian is not marked by a major mass extinction event....
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- Fall '10