| 单词 | myr |
| 释义 | > as lemmasMyr Myr n. Science million years. ΚΠ 1963 Radioactive Decay (Internat. Atomic Energy Agency Symp.) 383 Among the iron meteorites the exposure ages of the octahedrites seem to pile up around a value of about 500 Myr. 1975 Nature 6 Mar. 50/1 By about 70 Myr ago (late Cretaceous: Maastrichtian) there seems to have been a gap large enough to have prevented east–west migration of marine reef colonies. 1997 Sci. Amer. June 62/1 Exposed at the top of the hill lies a layer of hardened volcanic ash called the Moiti Tuff, which has been dated radiometrically to just over 3.9 Myr old. < as lemmas |
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