http://resource.geosciml.org/classifier/ics/ischart/BaseCambrianStage4SP
label | Stratotype Point Base of Cambrian Stage 4 | |||||||
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ratified GSSP | ||||||||
correlation event | Trilobite FAD Olenellus or Redlichia | |||||||
type |
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represents boundary |
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see also | index.html original |