==== Geologic Time ====

  * http://www.stratigraphy.org/index.php/ics-chart-timescale
  * http://resource.geosciml.org/
  * https://link.springer.com/article/10.1007%2Fs12145-014-0170-6
  * https://en.wikipedia.org/wiki/Geologic_time_scale#Naming_of_geologic_periods,_eras_and_epochs
  * http://vocabs.ands.org.au/repository/api/lda/csiro/international-chronostratigraphic-chart/2017/resource.html?uri=http://resource.geosciml.org/classifier/ics/ischart/BaseHoloceneSP

etc

{{http://www.stratigraphy.org/ICSchart/ChronostratChart2019-05.jpg}}