The Phanerozoic is composed of three eras—the Palaeozoic, Meso-zoic, and Cenozoic. It was during this time that the landmasses of the Earth came together in the supercontinent called Pangaea. Scientists believe that during the Palaeozoic there was increased volcanic activity and that atmospheric CO2 in the early part of this period may have been high based on evidence geologists have found in carbonate minerals from the time. Some estimates have been made that the atmospheric concentration of CO2 may have been 10 times greater in some locations than it is today.
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