Paleozoic
http://inspire.ec.europa.eu/codelist/GeochronologicEraValue/paleozoic
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Permian
Permian (older bound-299 +/-0.8 Ma, younger bound-251 +/-0.4 Ma)
IUGS /CGI value
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Carboniferous
Carboniferous (older bound-359.2 +/-2.5 Ma, younger bound-299 +/-0.8 Ma)
IUGS /CGI value
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Devonian
Devonian (older bound-416 +/-2.8 Ma, younger bound-359.2 +/-2.5 Ma)
IUGS /CGI value
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Silurian
Silurian (older bound-443.7 +/-1.5 Ma, younger bound-416 +/-2.8 Ma)
IUGS /CGI value
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Ordovician
Ordovician (older bound-488.3 +/-1.7 Ma, younger bound-443.7 +/-1.5 Ma)
IUGS /CGI value
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Cambrian
Cambrian (older bound-542 +/-1 Ma, younger bound-488.3 +/-1.7 Ma)
IUGS /CGI value
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