<?xml version='1.0' encoding='UTF-8'?>
<?xml-stylesheet type='text/xsl' href='/style/human.xsl'?>
<extension xmlns='http://rs.gbif.org/extension/'
    xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'
    xmlns:dc='http://purl.org/dc/terms/'
    xsi:schemaLocation='http://rs.gbif.org/extension/ http://rs.gbif.org/schema/extension.xsd'
    dc:title='Chronometric Age'
    name="ChronometricAge" namespace='http://rs.tdwg.org/chrono/terms/'
    rowType='http://rs.tdwg.org/chrono/terms/ChronometricAge'
    dc:issued='2026-07-21'
    dc:subject='dwc:Event dwc:Occurrence'
    dc:relation='http://rs.tdwg.org/chrono/terms/ChronometricAge'
    dc:description='Extended support for Darwin Core Events or Occurrences related to chronometric ages.'>

    <!-- ChronometricAge -->
    <property group='ChronometricAge' name='chronometricAgeID' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeID' label='Chronometric Age ID' dc:relation='None' dc:description='An identifier for the set of information associated with a chrono:ChronometricAge.' comments='May be a global unique identifier or an identifier specific to the dataset. This can be used to link this record to another repository where more information about the dataset is shared.' examples='`https://www.canadianarchaeology.ca/samples/70673`' required='false'/>
    <property group='ChronometricAge' name='verbatimChronometricAge' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/verbatimChronometricAge' label='Verbatim Chronometric Age' dc:relation='None' dc:description='The verbatim age for a specimen, whether reported by a dating assay, associated references, or legacy information.' comments='For example, this could be the radiocarbon age as given in an AMS dating report. This could also be simply what is reported as the age of a specimen in legacy collections data.' examples='`27 BC to 14 AD`, `stratigraphically pre-1104`' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeProtocol' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeProtocol' label='Chronometric Age Protocol' dc:relation='None' dc:description='A description of or reference to the methods used to determine the chrono:ChronometricAge.' comments=' This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`radiocarbon AMS`; `K-Ar dates for the lower most marker tuff`; `historic documentation`; `ceramic seriation`' required='true'/>
    <property group='ChronometricAge' name='uncalibratedChronometricAge' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/uncalibratedChronometricAge' label='Uncalibrated Chronometric Age' dc:relation='None' dc:description='The output of a dating assay before it is calibrated into an age using a specific conversion protocol.' examples='`1510 +/- 25 14C yr BP`, `16.26 Ma +/- 0.016`' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeConversionProtocol' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeConversionProtocol' label='Chronometric Age Conversion Protocol' dc:relation='None' dc:description='The method used for converting the chrono:uncalibratedChronometricAge into a chronometric age in years, as captured in the chrono:earliestChronometricAge, chrono:earliestChronometricAgeReferenceSystem, chrono:latestChronometricAge, and chrono:latestChronometricAgeReferenceSystem fields.' comments='For example, calibration of conventional radiocarbon age or the currently accepted age range of a cultural or geological period. This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`INTCAL13`; `sequential 6 phase Bayesian model and IntCal13 calibration`' required='false'/>
    <property group='ChronometricAge' name='earliestChronometricAge' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/earliestChronometricAge' label='Earliest Chronometric Age' dc:relation='None' dc:description='The maximum/earliest/oldest possible age of a specimen as determined by a dating method.' comments='The expected unit for this field is years. This field, if populated, must have an associated chrono:earliestChronometricAgeReferenceSystem.' examples='`100`' required='false'/>
    <property group='ChronometricAge' name='earliestChronometricAgeReferenceSystem' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/earliestChronometricAgeReferenceSystem' label='Earliest Chronometric Age Reference System' dc:relation='None' dc:description='The reference system associated with the chrono:earliestChronometricAge.' comments='Recommended best practice is to use a controlled vocabulary. This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`kya`; `mya`; `BP`; `AD`; `BCE`; `ka`; `Ma`; `Ga`' required='false'/>
    <property group='ChronometricAge' name='latestChronometricAge' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/latestChronometricAge' label='Latest Chronometric Age' dc:relation='None' dc:description='The minimum/latest/youngest possible age of a specimen as determined by a dating method.' comments='The expected unit for this field is years. This field, if populated, must have an associated chrono:latestChronometricAgeReferenceSystem.' examples='`27`' required='false'/>
    <property group='ChronometricAge' name='latestChronometricAgeReferenceSystem' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/latestChronometricAgeReferenceSystem' label='Latest Chronometric Age Reference System' dc:relation='None' dc:description='The reference system associated with the chrono:latestChronometricAge.' comments='Recommended best practice is to use a controlled vocabulary. This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`kya`; `mya`; `BP`; `AD`; `BCE`; `ka`; `Ma`; `Ga`' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeUncertaintyInYears' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeUncertaintyInYears' label='Chronometric Age Uncertainty In Years' dc:relation='None' dc:description='The temporal uncertainty of the chrono:earliestChronometricAge and chrono:latestChronometricAge in years.' comments='The expected unit for this field is years. The value in this field is number of years before and after the values given in the chrono:earliestChronometricAge and chrono:latestChronometricAge fields within which the actual values are estimated to be.' examples='`100`' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeUncertaintyMethod' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeUncertaintyMethod' label='Chronometric Age Uncertainty Method' dc:relation='None' dc:description='The method used to generate the value of chrono:chronometricAgeUncertaintyInYears.' comments=' This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`2-sigma calibrated range`; `Half of 95% confidence interval`' required='false'/>
    <property group='ChronometricAge' name='materialDated' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/materialDated' label='Material Dated' dc:relation='None' dc:description='A description of the material on which the chrono:chronometricAgeProtocol was actually performed, if known.' comments=' This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`Double Tuff`; `Charcoal found in Stratum V`; `charred wood`; `tooth`' required='false'/>
    <property group='ChronometricAge' name='materialDatedID' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/materialDatedID' label='Material Dated ID' dc:relation='None' dc:description='An identifier for the dwc:MaterialEntity on which the chrono:chronometricAgeProtocol was performed, if applicable.' examples='`dwc:materialEntityID: https://www.ebi.ac.uk/metagenomics/samples/SRS1930158`' required='false'/>
    <property group='ChronometricAge' name='materialDatedRelationship' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/materialDatedRelationship' label='Material Dated Relationship' dc:relation='None' dc:description='The relationship of the chrono:materialDated to the subject of the chrono:ChronometricAge record, from which the chrono:ChronometricAge of the subject is inferred.' comments='Recommended best practice is to use a controlled vocabulary.' examples='`sameAs` (cases where the subject material was completely destructively subsampled to get the ChronometricAge); `subsampleOf` (cases where part of the original specimen was extracted as the material used to determine the ChronometricAge); `inContextWith` (cases where the ChronometricAge is inferred from materialDated, such as sediments or cultural objects, in related temporal context); `stratigraphicallyCorrelatedWith` (cases where the ChronometricAge is inferred from materialDated in a stratigraphically correlated context)' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeDeterminedBy' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeDeterminedBy' label='Chronometric Age Determined By' dc:relation='None' dc:description='A list (concatenated and separated) of names of people, groups, or organizations who determined the chrono:ChronometricAge.' comments='Recommended best practice is to separate the values in a list with space vertical bar space ( | ). This term has an equivalent in the chronoiri: namespace that allows only an IRI as a value, whereas this term allows for any string literal value.' examples='`Michelle LeFebvre | Neill Wallis`' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeDeterminedDate' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeDeterminedDate' label='Chronometric Age Determined Date' dc:relation='None' dc:description='The date on which the chrono:ChronometricAge was determined.' comments='Recommended best practice is to use a date that conforms to ISO 8601-1:2019.' examples='`1963-03-08T14:07-0600` (8 Mar 1963 at 2:07pm in the time zone six hours earlier than UTC); `2009-02-20T08:40Z` (20 February 2009 8:40am UTC); `2018-08-29T15:19` (3:19pm local time on 29 August 2018); `1809-02-12` (some time during 12 February 1809); `1906-06` (some time in June 1906); `1971` (some time in the year 1971)' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeReferences' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeReferences' label='Chronometric Age References' dc:relation='None' dc:description='A list (concatenated and separated) of identifiers (publication, bibliographic reference, global unique identifier, URI) of literature associated with the chrono:ChronometricAge.' comments='Recommended best practice is to separate the values in a list with space vertical bar space ( | ).' examples='`Pluckhahn, Thomas J., Neill J. Wallis, and Victor D. Thompson. 2020 The History and Future of Migrationist Explanation in the Archaeology of the Eastern Woodlands: A Review and Case Study of the Woodland Period Gulf Coast. Journal of Archaeological Research. https://doi.org/10.1007/s10814-019-09140-x`' required='false'/>
    <property group='ChronometricAge' name='chronometricAgeRemarks' namespace='http://rs.tdwg.org/chrono/terms/' qualName='http://rs.tdwg.org/chrono/terms/chronometricAgeRemarks' label='Chronometric Age Remarks' dc:relation='None' dc:description='Notes or comments about the chrono:ChronometricAge.' examples='`Beta Analytic number: 323913 | One of the Crassostrea virginica right valve specimens from North Midden Feature 17 was chosen for AMS dating, but it is unclear exactly which specimen it was.`' required='false'/>
</extension>
