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rahvusvaheliselt kindlaks määratud stratigraafiliste üksuste alguspunktid
Global Boundary Stratotype Section and Point . Geoloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//get/Global%20Boundary%20Stratotype%20Section%20and%20Point/1/eng (14.07.2026)