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期 (地质学)

维基百科,自由的百科全书
·
年代地层學
岩段(地层
地质年代學
時間間隔
说明
共有4个,大於5亿年
共有14个,數亿年
共有22個,數千萬至數億年
共有34個,數千万年
共有99個,数百万年
小于期,国际地层委员会(ICS)不使用
规范用法:恐龙生活在侏罗纪(时间),恐龙化石在侏罗系地层中找到。上、下修饰年代地层单位。早、晚修饰地质年代单位。(例:下白垩统对应早白垩世)

(age)是指地質學考古學的一個時間單位,划分为更小的时间周期,也被劃分為更小的時間週期。

地質年代參照表

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参见

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參考資料

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  1. ^ Paleontologists often refer to faunal stage英语faunal stages rather than geologic (geological) periods. The stage nomenclature is quite complex. For an excellent time-ordered list of faunal stages, see The Paleobiology Database. [2006-03-19]. 
  2. ^ 2.0 2.1 所有全球年代地层单位均由其底界的全球界线层型剖面和点位(GSSP)界定,包括长期由全球标准地层年龄(GSSA)界定的太古宇和元古宇各单位。斜体代表非正式名称或尚未命名单位的临时名称。图件及已批准GSSP的详情参见国际地层委员会官网。GSSP被标记为*,而GSSA被标记为+
    年龄值仍在不断修订;显生宇和埃迪卡拉系的单位不能由年龄界定,而只能由GSSP界定。显生宇中没有确定GSSP或精确年龄值的单位,则标注了近似年龄值(~)。
  3. ^ References to the "Post-Cambrian Supereon" are not universally accepted, and therefore must be considered unofficial.
  4. ^ Historically, the 新生代 has been divided up into the 第四紀 and 第三紀 sub-eras, as well as the 新近纪 and 古近纪 periods. The 2009 version of the ICS time chart recognizes a slightly extended Quaternary as well as the Paleogene and a truncated Neogene, the Tertiary having been demoted to informal status.
  5. ^ 5.0 5.1 5.2 5.3 5.4 5.5 For more information on this, see the following articles: 地球大气层, 二氧化碳, Carbon dioxide in the Earth's atmosphere英语Carbon dioxide in the Earth's atmosphere, global warming, 氣候變遷, Image:Phanerozoic_Carbon_Dioxide.png, Image:65 Myr Climate Change.png, Image:Five Myr Climate Change.png, and Template:DF temperature
  6. ^ 6.0 6.1 在北美,石炭纪被细分为 Mississippian英语Mississippian and Pennsylvanian英语Pennsylvanian Periods.
  7. ^ 7.0 7.1 上石炭紀地質在歐美及中國均以盛產煤炭著名,因此便以石炭紀為此時代地層的名稱,但在美國則以密士西必紀作為下石炭紀,另以賓夕法尼亞紀稱上部石炭紀。[1]
  8. ^ The Precambrian is also known as Cryptozoic.
  9. ^ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 The Proterozoic, Archean and Hadean are often collectively referred to as the Precambrian Time or sometimes, also the Cryptozoic.
  10. ^ The age of the oldest measurable craton, or continental crust, is dated to 3600–3800 Ma
  11. ^ Geology.wisc.edu
  12. ^ Bowring, Samuel A.; Williams, Ian S. Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada. Contributions to Mineralogy and Petrology. 1999, 134 (1): 3. Bibcode:1999CoMP..134....3B. doi:10.1007/s004100050465.  The oldest rock on Earth is the Acasta Gneiss英语Acasta Gneiss, and it dates to 4.03 Ga, located in the Northwest Territories of Canada.