| 释义 |
Examples:Cambrian (geological period 545-495m years ago)—Permian (geological period 292-250m years ago)—Triassic (geological period 250-205m years ago)—Jurassic (geological period 205-140m years ago)—quaternary (geological period covering the recent ice ages over the last 180,000 years)—Ordovician (geological period 495-440m years ago)—pre-Cambrian, geological period before c. 540m years ago—Carboniferous (geological period 354-292m years ago)—Cretaceous (geological period 140-65m years ago)—Devonian (geological period 417-354m years ago)—the year defined as the period between successive equinoxes—Holocene (geological period covering approx 12000 years since the last ice age)—lower Cambrian (geological period approx 530 million years ago)—Ediacaran period (c. 635-542 million years ago), late phase of pre-Cambrian geological era—the corresponding time period (in a different year etc)—Silurian (geological period 440-417m years ago)—Cambrian geological period (545-495m years ago)— |