Class <<Type>> GeochronologicEra (extends TimeOrdinalEra)

The association of an era with a stratotype is optional. In the GSSP approach recommended by ICS for the Global Geologic Timescale, Unit Stratotypes are not used.

Rather, the association of an Era with geologic units and sections is indirect, via the association of an era with Boundaries, which are in turn tied to Stratotype Points, which occur within host Stratotype Sections.

Note that the "German School" defines stratigraphic eras conceptually, without reference to stratotypes.

Local Subclasses: (none)

Attributes

Name Type Bounds From Class Notes
rank GeochronologicEraRank 1..1 GeochronologicEra A term from a controlled vocabulary describing the rank of the time period (eg, eon, era, period, stage)
Attribute tagged values
Tag Value
inlineOrByReference byReference
sequenceNumber 1
 

Outbound Associations

Name Type Multiplicity From Class Notes
start TimeOrdinalEraBoundary 1 TimeOrdinalEra Older time boundary of an era
Association tagged values
Tag Value
sequenceNumber 2
nillable True
end TimeOrdinalEraBoundary 1 TimeOrdinalEra Younger time boundary of an era
Association tagged values
Tag Value
sequenceNumber 3
nillable True
member TimeOrdinalEra 0..* TimeOrdinalEra
Association tagged values
Tag Value
sequenceNumber 5
stratotype StratigraphicSection 1 GeochronologicEra
Association tagged values
Tag Value
sequenceNumber 2
nillable True
 

Constraints

Constraint Type Status Weight
 

Tagged values

Tag Value Notes
byValuePropertyType false Values: true | false
Default: false
Description: enforce the 'by value' property pattern without xlinks
noPropertyType false Values: true | false
Default: false
Description: suppress automatic creation of *PropertyType complexType
 

GML-conformant XML Implementation Details

<xs:element xmlns:xs="http://www.w3.org/2001/XMLSchema" name="GeochronologicEra" substitutionGroup="gsmltrs:TimeOrdinalEra" type="gsmlgt:GeochronologicEraType">

    <xs:annotation>

        <xs:documentation>The association of an era with a stratotype is optional.  In the GSSP approach recommended by ICS for the Global Geologic Timescale, Unit Stratotypes are not used. 



Rather, the association of an Era with geologic units and sections is indirect, via the association of an era with Boundaries, which are in turn tied to Stratotype Points, which occur within host Stratotype Sections. 



Note that the "German School" defines stratigraphic eras conceptually, without reference to stratotypes.</xs:documentation>

    </xs:annotation>

</xs:element>
<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="GeochronologicEraType">

    <xs:complexContent>

        <xs:extension base="gsmltrs:TimeOrdinalEraType">

            <xs:sequence>

                <xs:element name="rank" type="gml:ReferenceType">

                    <xs:annotation>

                        <xs:documentation>A term from a controlled vocabulary describing the rank of the time period (eg, eon, era, period, stage)</xs:documentation>

                    </xs:annotation>

                </xs:element>

                <xs:element name="stratotype" type="gsmlgt:StratigraphicSectionPropertyType" nillable="true"/>

            </xs:sequence>

        </xs:extension>

    </xs:complexContent>

</xs:complexType>
<xs:complexType xmlns:xs="http://www.w3.org/2001/XMLSchema" name="GeochronologicEraPropertyType">

    <xs:sequence minOccurs="0">

        <xs:element ref="gsmlgt:GeochronologicEra"/>

    </xs:sequence>

    <xs:attributeGroup ref="gml:AssociationAttributeGroup"/>

    <xs:attributeGroup ref="gml:OwnershipAttributeGroup"/>

</xs:complexType>