| urn:cgi:classifier:CGI:StratChart:2009:Calymmian1 |
| urn:cgi:classifier:CGI:StratChart:2009:Ectasian3 |
| urn:cgi:classifier:CGI:StratChart:2009:Neoarchean1 |
| urn:cgi:classifier:CGI:StratChart:2009:Neoarchean2 |
| urn:cgi:classifier:CGI:StratChart:2009:Orosirian1 |
| urn:cgi:classifier:CGI:StratChart:2009:Orosirian2 |
| urn:cgi:classifier:CGI:StratChart:2009:Orosirian3 |
| urn:cgi:classifier:CGI:StratChart:2009:Orosirian4 |
| urn:cgi:classifier:CGI:StratChart:2009:Orosirian5 |
| urn:cgi:classifier:CGI:StratChart:2009:Orosirian7 |
| urn:cgi:classifier:CGI:StratChart:2009:Siderian1 |
| urn:cgi:classifier:CGI:StratChart:2009:Siderian2 |
| urn:cgi:classifier:CGI:StratChart:2009:Statherian3 |
| urn:cgi:classifier:CGI:StratChart:2009:Statherian4 |
| urn:cgi:classifier:CGI:StratChart:2009:Tonian1 |
| urn:cgi:classifier:CGI:StratChart:2009:Tonian2 |
| urn:cgi:classifier:ICS:StratChart:200908:Cambrian |
| urn:cgi:classifier:ICS:StratChart:200908:Devonian |
| urn:cgi:classifier:ICS:StratChart:200908:Ediacaran |
| urn:cgi:classifier:ICS:StratChart:200908:Holocene |
| urn:cgi:classifier:ICS:StratChart:200908:Llandovery |
| urn:cgi:classifier:ICS:StratChart:200908:LowerOrdovician |
| urn:cgi:classifier:ICS:StratChart:200908:Ludlow |
| urn:cgi:classifier:ICS:StratChart:200908:Mesoarchean |
| urn:cgi:classifier:ICS:StratChart:200908:MiddleDevonian |
| urn:cgi:classifier:ICS:StratChart:200908:MiddleOrdovician |
| urn:cgi:classifier:ICS:StratChart:200908:Pleistocene |
| urn:cgi:classifier:ICS:StratChart:200908:Pridoli |
| urn:cgi:classifier:ICS:StratChart:200908:Rhyacian |
| urn:cgi:classifier:ICS:StratChart:200908:UpperOrdovician |
| urn:cgi:classifier:ICS:StratChart:200908:UpperPleistocene |
| urn:cgi:classifier:ICS:StratChart:200908:Wenlock |