The Silurian - to the east and Siberia to the north...

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The Silurian Baragwanathia is an undoubted lycophyte from the middle Silurian deposits of Australia. It has microphyllous leaves spirally attached to the stem, and sporangia clustered in some areas of the plant, although not in terminal strobili. Many paleobotanists consider Baragwanathia ancestral to the modern lycophytes and later lepidodendrids of the carboniferous forests. The Silurian World Silurian climates were characterized by a warming and return to moderate temperatures following the terminal Ordovician glaciation (and the resulting mass extinction). North America remained near the equator, but began to join with Baltical
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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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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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The Silurian - to the east and Siberia to the north...

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