Meghalayan

Não deve ser confundido com Meghalaya.

Na escala de tempo geológico, o Meghalayan é a última idade ou estágio mais alto do Quaternário. [3] É também a parte superior ou mais recente de três subdivisões da época ou série do Holoceno. [4] [5] Sua Seção e Ponto de Estratótipo de Fronteira Global (GSSP) é uma formação de caverna Mawmluh em Meghalaya, nordeste da Índia. [6] A caverna de Mawmluh é uma das mais longas e profundas cavernas da Índia, e as condições aqui eram adequadas para preservar os sinais químicos da transição em eras. [7]
O Meghalayan começa 4.200 anos BP, ou seja, antes de 1950 (cerca de 2250 aC), [8] deixando espaço aberto para a possível criação do Antropoceno a partir de 1950 para a frente. [9] [10] A idade começou com uma seca de 200 anos que afetou as civilizações humanas no Egito, na Grécia, na Síria, na Canaã, na Mesopotâmia, no vale do Indo e no vale do rio Yangtze. [8] "O fato de que o início desta era coincide com uma mudança cultural causada por um evento climático global a torna única", de acordo com Stanley Finney, Secretário Geral da União Internacional de Ciências Geológicas. A idade foi oficialmente ratificada pela Comissão Internacional sobre Estratigrafia em julho de 2018, juntamente com a Gronelândia e a Northgrippian [6].

See also

• Geologic time scale
• 4.2 kiloyear event

References

1. 
   

Cohen, K.M.; Finney, S.C.; Gibbard, P.L.; Fan, J.-X. "International Chronostratigraphic Chart". International Commission on Stratigraphy. Retrieved July 10, 2018.

"announcement ICS chart v2018/07". Retrieved August 9, 2018.

Cohen, Kim Mikkel, David A. T. Harper, Philip Leonard Gibbard, and Junxuan Fan. "The ICS International Chronostratigraphic Chart". International Commission on Stratigraphy. Retrieved 15 July 2018.

"Scientists call our era the Meghalayan Age. Here's what the world was like when it began".

"'Meghalayan Age': Latest phase in Earth's history named after Indian state, began 4,200 years ago".

International Commission on Stratigraphy. "ICS chart containing the Quaternary and Cambrian GSSPs and new stages (v 2018/07) is now released!". Retrieved 15 July 2018.

"'Meghalayan Age' makes the state a part of geologic history". https://www.hindustantimes.com/. 2018-07-18. Retrieved 2018-07-26. External link in |work= (help)

Jonathan Amos (July 18, 2018). "Welcome to the Meghalayan Age - a new phase in history". BBC. Retrieved July 19, 2018.

International Commission on Stratigraphy. "Collapse of civilizations worldwide defines youngest unit of the Geologic Time Scale". News and Meetings. Retrieved 15 July 2018.

10. Michael Irving (July 19, 2018). "Time for the Meghalayan: A new geological age has officially been declared". Retrieved July 19, 2018.

Subdivisions of the Quaternary System
System/ Period	Series/ Epoch	Stage/ Age	Age (Ma)
Quaternary	Holocene	Meghalayan	0	0.0042
		Northgrippian	0.0042	0.0082
		Greenlandian	0.0082	0.0117
	Pleistocene	'Tarantian'	0.0117	0.126
		'Chibanian'	0.126	0.781
		Calabrian	0.781	1.80
		Gelasian	1.80	2.58
Neogene	Pliocene	Piacenzian	older
Subdivision of the Quaternary period according to the ICS, as of 2018.[1] Dates are relative to the year 2000 (e.g. Greenlandian began 11,700 years before 2000), except for the Meghalayan which began 4,200 years BP i.e. before 1950.[2][clarification needed] 'Chibanian' and 'Tarantian' are informal, unofficial names proposed to replace the also informal, unofficial 'Middle Pleistocene' and 'Upper Pleistocene' subseries/subepochs respectively. In Europe and North America, the Holocene is subdivided into Preboreal, Boreal, Atlantic, Subboreal, and Subatlantic stages of the Blytt–Sernander time scale. There are many regional subdivisions for the Upper or Late Pleistocene; usually these represent locally recognized cold (glacial) and warm (interglacial) periods. The last glacial period ends with the cold Younger Dryas substage.
v t e Geologic history of Earth
Cenozoic era¹ (present–66.0 Mya)	Quaternary (present–2.588 Mya) Holocene (present–11.784 kya) Pleistocene (11.784 kya–2.588 Mya) Neogene (2.588–23.03 Mya) Pliocene (2.588–5.333 Mya) Miocene (5.333–23.03 Mya) Paleogene (23.03–66.0 Mya) Oligocene (23.03–33.9 Mya) Eocene (33.9–56.0 Mya) Paleocene (56.0–66.0 Mya)
Mesozoic era¹ (66.0–251.902 Mya)	Cretaceous (66.0–145.0 Mya) Late (66.0–100.5 Mya) Early (100.5–145.0 Mya) Jurassic (145.0–201.3 Mya) Late (145.0–163.5 Mya) Middle (163.5–174.1 Mya) Early (174.1–201.3 Mya) Triassic (201.3–251.902 Mya) Late (201.3–237 Mya) Middle (237–247.2 Mya) Early (247.2–251.902 Mya)
Paleozoic era¹ (251.902–541.0 Mya)	Permian (251.902–298.9 Mya) Lopingian (251.902–259.8 Mya) Guadalupian (259.8–272.3 Mya) Cisuralian (272.3–298.9 Mya) Carboniferous (298.9–358.9 Mya) Pennsylvanian (298.9–323.2 Mya) Mississippian (323.2–358.9 Mya) Devonian (358.9–419.2 Mya) Late (358.9–382.7 Mya) Middle (382.7–393.3 Mya) Early (393.3–419.2 Mya) Silurian (419.2–443.8 Mya) Pridoli (419.2–423.0 Mya) Ludlow (423.0–427.4 Mya) Wenlock (427.4–433.4 Mya) Llandovery (433.4–443.8 Mya) Ordovician (443.8–485.4 Mya) Late (443.8–458.4 Mya) Middle (458.4–470.0 Mya) Early (470.0–485.4 Mya) Cambrian (485.4–541.0 Mya) Furongian (485.4–497 Mya) Series 3 (497–509 Mya) Series 2 (509–521 Mya) Terreneuvian (521–541.0 Mya)
Proterozoic eon² (541.0 Mya–2.5 Gya)	Neoproterozoic era (541.0 Mya–1 Gya) Ediacaran (541.0–~635 Mya) Cryogenian (~635–~720 Mya) Tonian (~720 Mya–1 Gya) Mesoproterozoic era (1–1.6 Gya) Stenian (1–1.2 Gya) Ectasian (1.2–1.4 Gya) Calymmian (1.4–1.6 Gya) Paleoproterozoic era (1.6–2.5 Gya) Statherian (1.6–1.8 Gya) Orosirian (1.8–2.05 Gya) Rhyacian (2.05–2.3 Gya) Siderian (2.3–2.5 Gya)
Archean eon² (2.5–4 Gya)	Eras Neoarchean (2.5–2.8 Gya) Mesoarchean (2.8–3.2 Gya) Paleoarchean (3.2–3.6 Gya) Eoarchean (3.6–4 Gya)
Hadean eon² (4–4.6 Gya)
kya = thousands years ago. Mya = millions years ago. Gya = billions years ago.¹ = Phanerozoic eon. ² = Precambrian supereon. Source: (2017/02). International Commission on Stratigraphy. Retrieved 13 July 2015. Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units USGS Retrieved 10 March 2013.