Late Ordovician

Source: Wikipedia, the free encyclopedia.

The Late Ordovician, also called the Upper Ordovician by geologists, is the third epoch of the Ordovician period.[1]

At this time Western and Central Europe and North America collided to form Laurentia, while glaciers built up in Gondwana, which was positioned over the South Pole. This caused a drop in global temperatures, resulting in "ice house" conditions.[2]

For most of this time life continued to flourish, but at and near the end of the period there were

endocerid cephalopods died out completely, except for possible rare Silurian
forms. The Ordovician-Silurian Extinction Events may have been caused by an ice age that occurred at the end of the Ordovician period as the end of the Late Ordovician was one of the coldest times in the last 600 million years of earth history.

References

  1. doi:10.1016/0031-0182(85)90089-6
    .
  2. ISSN 1943-2682
    .

External links
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