{ "format" : "linked-data-api", "version" : "0.2", "result" : {"_about" : "https://vocabs.ardc.edu.au/repository/api/lda/csiro/international-chronostratigraphic-chart/geologic-time-scale-2020/resource.text?uri=http://resource.geosciml.org/classifier/ics/ischart/Silurian", "definition" : "https://vocabs.ardc.edu.au/repository/api/lda/csiro/international-chronostratigraphic-chart/geologic-time-scale-2020/resource.text?uri=http://resource.geosciml.org/classifier/ics/ischart/Silurian", "extendedMetadataVersion" : "https://vocabs.ardc.edu.au/repository/api/lda/csiro/international-chronostratigraphic-chart/geologic-time-scale-2020/resource.text?_metadata=all&uri=http://resource.geosciml.org/classifier/ics/ischart/Silurian", "primaryTopic" : {"_about" : "http://resource.geosciml.org/classifier/ics/ischart/Silurian", "broader" : [{"_about" : "http://resource.geosciml.org/classifier/ics/ischart/Paleozoic", "intervalContains" : "http://resource.geosciml.org/classifier/ics/ischart/Silurian", "label" : {"_value" : "Paleozoic Era", "_lang" : "en"} , "narrower" : ["http://resource.geosciml.org/classifier/ics/ischart/Silurian"]} ], "broaderTransitive" : [{"_about" : "http://resource.geosciml.org/classifier/ics/ischart/Phanerozoic", "label" : {"_value" : "Phanerozoic Eon", "_lang" : "en"} , "narrowerTransitive" : ["http://resource.geosciml.org/classifier/ics/ischart/Silurian"]} ], "comment" : [{"_value" : "older bound -443.8 +|-1.5 Ma", "_lang" : "en"} , {"_value" : "younger bound -419.2 +|-3.2 Ma", "_lang" : "en"} ], "definition" : "The Silurian is a geologic period and system that extends from the end of the Ordovician Period, about 443.7 ± 1.5 million years ago (mya), to the beginning of the Devonian Period, about 416.0 ± 2.8 mya. 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