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Examples
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Let's now roll the clock further back to the Pennsylvanian Period of the late Paleozoic.
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Swamps which would later develop into coal developed, and amphibians-which are dependent on moist conditions-flourished; in fact, the Pennsylvanian Period is known as the "Age of Amphibians."
PhysOrg.com - latest science and technology news stories PhysOrg Team 2010
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There are subtle but noticeable changes in the character and properties of the coal beds throughout the Pennsylvanian Period, most likely due to Earth's cooling climate and quite possibly also due to declining atmospheric carbon dioxide concentrations.
WHAT REALLY HAPPENED 2009
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There are subtle but noticeable changes in the character and properties of the coal beds throughout the Pennsylvanian Period, most likely due to Earth's cooling climate and quite possibly also due to declining atmospheric carbon dioxide concentrations.
WHAT REALLY HAPPENED 2008
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