en
2015-08-18 17:58 PM CEST
http://inspire.ec.europa.eu/codelist/GeochronologicEraValue/hettangian:2
http://inspire.ec.europa.eu/codelist/GeochronologicEraValue/hettangian
http://inspire.ec.europa.eu/codelist/GeochronologicEraValue/hettangian:1
Hettangian (older bound-199.6 +/-0.6 Ma, younger bound-196.5 +/-1 Ma)
IUGS /CGI value