| 词条 | Meghalayan |
| 释义 |
In the geologic time scale, the Meghalayan is the latest age or uppermost stage of the Quaternary.[1] It is also the upper, or latest, of three subdivisions of the Holocene epoch or series.[2][3] Its Global Boundary Stratotype Section and Point (GSSP) is a Mawmluh cave formation in Meghalaya, northeast India.[4] Mawmluh cave is one of the longest and deepest caves in India, and conditions here were suitable for preserving chemical signs of the transition in ages.[5] The global auxiliary stratotype is an ice core from Mount Logan in Canada.[6] The Meghalayan begins 4,200 years BP, i.e., before 1950 ({{circa}} 2250 BCE),[7] leaving open room for the possible creation of the Anthropocene from 1950 forward.[8][9] The age began with a 200-year drought that impacted human civilizations in Egypt, Greece, Syria, Canaan, Mesopotamia, the Indus Valley and the Yangtze River Valley.[7] "The fact that the beginning of this age coincides with a cultural shift caused by a global climate event makes it unique," according to Stanley Finney, Secretary General of the International Union of Geological Sciences.[9] The age was officially ratified by the International Commission on Stratigraphy in July 2018 along with the Greenlandian and the Northgrippian.[4] See also
References1. ^{{cite web |last1=Cohen |first1=Kim Mikkel, David A. T. Harper, Philip Leonard Gibbard, and Junxuan Fan |title=The ICS International Chronostratigraphic Chart |url=http://www.stratigraphy.org/index.php/ics-chart-timescale |website=International Commission on Stratigraphy |accessdate=15 July 2018}} {{Geological history|p|m}}2. ^{{cite web|url=https://www.indiatoday.in/india/story/meghalayan-age-what-the-world-was-like-when-it-began-1290138-2018-07-19|title=Scientists call our era the Meghalayan Age. Here's what the world was like when it began}} 3. ^{{cite web|url=https://scroll.in/latest/887119/meghalayan-age-latest-phase-in-earths-history-named-after-indian-state-began-4200-years-ago|title=‘Meghalayan Age’: Latest phase in Earth’s history named after Indian state, began 4,200 years ago}} 4. ^1 {{cite web |author= International Commission on Stratigraphy |title= ICS chart containing the Quaternary and Cambrian GSSPs and new stages (v 2018/07) is now released! |url= http://www.stratigraphy.org/index.php/ics-news-and-meetings/120-ics-chart-containing-the-quaternary-gssps-and-new-stages-v-2018-07-is-now-released |accessdate= 15 July 2018}} 5. ^{{Cite news|url=https://www.hindustantimes.com/science/meghalayan-age-makes-the-state-a-part-of-geologic-history/story-bvbKrd33IXgMD1o6BaSjmM.html|title=‘Meghalayan Age’ makes the state a part of geologic history|date=2018-07-18|work=Hindustan Times|access-date=2018-07-26|language=en}} 6. ^[https://www.qpg.geog.cam.ac.uk/news/formalsubdivisionoftheholoceneseriesgeogr18.pdf Formal subdivision of the Holocene Series/Epoch] 7. ^1 {{cite web |url=https://www.bbc.com/news/science-environment-44868527 |title=Welcome to the Meghalayan Age - a new phase in history |work=BBC |author=Jonathan Amos |date=July 18, 2018 |accessdate=July 19, 2018}} 8. ^{{cite web |author= International Commission on Stratigraphy |title= Collapse of civilizations worldwide defines youngest unit of the Geologic Time Scale |url= http://www.stratigraphy.org/index.php/ics-news-and-meetings/119-collapse-of-civilizations-worldwide-defines-youngest-unit-of-the-geologic-time-scale |website= News and Meetings |accessdate= 15 July 2018}} 9. ^1 {{cite web |url=https://newatlas.com/new-geological-age-declared-meghalayan/55532/ |title=Time for the Meghalayan: A new geological age has officially been declared |work= |author=Michael Irving |date=July 19, 2018 |accessdate=July 19, 2018}} External links
2 : Holocene|Quaternary geochronology |
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