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Palaeozoic era
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Palaeozoic era

Era of geological time 570–245 million years ago. It comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian periods. The Cambrian, Ordovician, and Silurian constitute the Lower or Early Palaeozoic; the Devonian, Carboniferous, and Permian make up the Upper or Late Palaeozoic. The era includes the evolution of hard-shelled multicellular life forms in the sea; the invasion of land by plants and animals; and the evolution of fish, amphibians, and early reptiles.
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As with all fossil organisms having no modern direct descendants, we are left to ponder precisely how the rostroconchs made their living in the seas of the Paleozoic Era.
Head down in the Paleozoic sea; this may be how one clam-like mollusc ... by Rudkin, Dave / ROM Magazine
When the temperature dropped right after the mid Paleozoic Era it only stayed low for a little while and then climbed right back to 27 degrees.
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The Mesozoic Era begins at the end of the Permian Period Mass extinction had eliminated most of the species of life that had existed throughout the Paleozoic Era The Mesozoic Era begins at the end of the Permian Period.
The Mesozoic Era by Claudia Mann / Reference and Education community
 
 
 
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