Jurassic

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Jurassic Period
201.3–145 million years ago
Mean atmospheric O
2
content ower period duration
c. 26 vol %[1][2]
(130 % of modern level)
Mean atmospheric CO
2
content ower period duration
c. 1950 ppm[3][4]
(7 times pre-industrial level)
Mean surface temperature ower period duration c. 16.5 °C[5][6]
(3 °C above modern level)
Key events in the Jurassic
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-205 —
-200 —
-195 —
-190 —
-185 —
-180 —
-175 —
-170 —
-165 —
-160 —
-155 —
-150 —
-145 —
An approximate timescale of key Jurassic events.
Vertical axis: millions of years ago.

The Jurassic (frae Jura Moontains) is a geologic period and system that accordin tae current scienteefic consensus, spans 56.3 million years frae the end o the Triassic Period 201.3 million years ago (Mya) tae the beginnin o the Cretaceous Period 145 Mya.[note 1]

Notes[eedit | eedit soorce]

  1. A 140 Ma age for the Jurassic-Cretaceous instead o the uisually acceptit 145 Ma wis proponed in 2014 based on a stratigrafic study o Vaca Muerta Formation in Neuquén Basin, Argentinae.[7] Víctor Ramos, ane o the authors o the study proponin the 140 Ma boondary age, sees the study as a "first step" taewart formally chyngin the age in the Internaitional Union o Geological Sciences.[8]

References[eedit | eedit soorce]

  1. Image:Sauerstoffgehalt-1000mj.svg
  2. Image:OxygenLevelsThroughEarthHistory.png
  3. Image:Phanerozoic Carbon Dioxide.png
  4. Image:CO2LevelsThroughEarthHistory.png
  5. Image:All palaeotemps.png
  6. Image:TemperatureLevelsOverEarthHistory.png
  7. Vennari, Verónica V.; Lescano, Marina; Naipauer, Maximiliano; Aguirre-Urreta, Beatriz; Concheyro, Andrea; Schaltegger, Urs; Armstrong, Richard; Pimentel, Marcio; Ramos, Victor A. (2014). "New constraints on the Jurassic–Cretaceous boundary in the High Andes using high-precision U–Pb data". Gondwana Research. 26: 374–385. doi:10.1016/j.gr.2013.07.005. Retrieved 16 Januar 2016. 
  8. Jaramillo, Jessica. "Entrevista al Dr. Víctor Alberto Ramos, Premio México Ciencia y Tecnología 2013" (in Spanish). Si logramos publicar esos nuevos resultados, sería el primer paso para cambiar formalmente la edad del Jurásico-Cretácico. A partir de ahí, la Unión Internacional de la Ciencias Geológicas y la Comisión Internacional de Estratigrafía certificaría o no, depende de los resultados, ese cambio.