| Late Ordovician |
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| SHOPPER'S DELIGHT | |
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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. For most of this time life continued to flourish, but at the end of the period there was a Mass-extinction that seriously affected Plankton ic forms like Conodont s, Graptolite s, and some groups of Trilobite s ( Agnostida and Pytchopariida , which compeletly died out, while the Asaphida were much reduced). Brachiopod s and Bryozoa ns and Echinoderm s were also heavily affected, and the Endocerid Nautiloid s died out completely, except for possible rare Silurian forms. EXTERNAL LINKS
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