| 释义 |
Examples:tertiary (geological era since the extinction of the dinosaurs at the Cretaceous-Tertiary boundary 65 million years ago)—lower Cambrian series (geological strata from approx 530 million years ago)—lower Cambrian (geological period approx 530 million years ago)—Ediacaran period (c. 635-542 million years ago), late phase of pre-Cambrian geological era—Sinian (c. 800-542 million years ago), late phase of pre-Cambrian geological era—Ediacaran (c. 635-542 million years ago), late phase of pre-Cambrian geological era— |