<xs:simpleType name="GeochronologicalRank">
<xs:annotation>
<xs:documentation>Qualifier for the geological time denoted by the GeochronologicalUnit: eon, era, epoch, etc.</xs:documentation>
</xs:annotation>
<xs:restriction base="eml:TypeEnum">
<xs:enumeration value="eon"/>
<xs:enumeration value="era"/>
<xs:enumeration value="period"/>
<xs:enumeration value="epoch"/>
<xs:enumeration value="age"/>
<xs:enumeration value="chron"/>
</xs:restriction>
</xs:simpleType>
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