{"thcode":2,"term":{"code":1649,"name":"Paleozoic","parent":1652,"scope":"Era of geologic time approximately 542 to 251 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},"uf":[],"bt":[{"code":1652,"name":"Phanerozoic","parent":1634,"scope":"Eon of geologic time approximately 542 million years ago extending to the present. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1634,"name":"geologic time periods","parent":1663,"scope":null},{"code":1663,"name":"time periods","parent":1,"scope":"Geologic time periods and seasons of the year"},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[{"code":1626,"name":"Cambrian","parent":1649,"scope":"Period of geologic time approximately 542 to 488 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1630,"name":"Devonian","parent":1649,"scope":"Period of geologic time approximately 416 to 359 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1642,"name":"Mississippian","parent":1649,"scope":"Subperiod of geologic time approximately 359 to 318 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1645,"name":"Ordovician","parent":1649,"scope":"Period of geologic time approximately 488 to 444 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1650,"name":"Pennsylvanian","parent":1649,"scope":"Subperiod of geologic time approximately 318 to 299 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1651,"name":"Permian","parent":1649,"scope":"Period of geologic time approximately 299 to 251 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"},{"code":1659,"name":"Silurian","parent":1649,"scope":"Period of geologic time approximately 444 to 416 million years ago. https:\/\/doi.org\/10.3133\/fs20103059"}],"rt":[]}