Back Senomanium Afrikaans السينوماني Arabic Cenomanianu AST Cenomanià Catalan Cenoman Czech Cenomanium German Cenomanio Esperanto Cenomaniense Spanish Cenomaniar Basque سنومانین Persian
| Cenomanian | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chronology | |||||||||
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| Etymology | |||||||||
| Name formality | Formal | ||||||||
| Usage information | |||||||||
| Celestial body | Earth | ||||||||
| Regional usage | Global (ICS) | ||||||||
| Time scale(s) used | ICS Time Scale | ||||||||
| Definition | |||||||||
| Chronological unit | Age | ||||||||
| Stratigraphic unit | Stage | ||||||||
| Time span formality | Formal | ||||||||
| Lower boundary definition | FAD of the Planktonic Foraminifer Rotalipora globotruncanoides | ||||||||
| Lower boundary GSSP | Mont Risoux, Hautes-Alpes, France 44°23′33″N 5°30′43″E / 44.3925°N 5.5119°E | ||||||||
| Lower GSSP ratified | 2002[2] | ||||||||
| Upper boundary definition | FAD of the Ammonite Watinoceras devonense | ||||||||
| Upper boundary GSSP | Rock Canyon, Colorado, US 38°16′56″N 104°43′39″W / 38.2822°N 104.7275°W | ||||||||
| Upper GSSP ratified | September 2003[3] | ||||||||
The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age of the Late Cretaceous Epoch or the lowest stage of the Upper Cretaceous Series.[4] An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age. Both age and stage bear the same name.
As a unit of geologic time measure, the Cenomanian Age spans the time between[5] 100.5 and 93.9 million years ago (Mya). In the geologic timescale, it is preceded by the Albian and is followed by the Turonian. The Upper Cenomanian starts around at 95 Mya.[citation needed]
The Cenomanian is coeval with the Woodbinian of the regional timescale of the Gulf of Mexico and the early part of the Eaglefordian of the regional timescale of the East Coast of the United States.
At the end of the Cenomanian, an anoxic event took place, called the Cenomanian-Turonian boundary event or the "Bonarelli event", that is associated with a minor extinction event for marine species.
Cenomanithrips, an extinct thrips of the Stenurothripidae family, was named after the Cenomanian, the age of the Myanmar amber in which it was discovered.[6]
- ^ International Commission on Stratigraphy. "ICS - Chart/Time Scale". www.stratigraphy.org.
- ^ Kennedy, W.; Gale, A.; Lees, J.; Caron, M. (March 2004). "The Global Boundary Stratotype Section and Point (GSSP) for the base of the Cenomanian Stage, Mont Risou, Hautes-Alpes, France" (PDF). Episodes. 27: 21–32. doi:10.18814/epiiugs/2004/v27i1/003. Retrieved 13 December 2020.
- ^ Kennedy, W. J.; I. Walaszczyk; W. A. Cobban (2005). "The Global Boundary Stratotype Section and Point for the base of the Turonian Stage of the Cretaceous: Pueblo, Colorado, U.S.A." (PDF). Episodes. 28 (2): 93–104. doi:10.18814/epiiugs/2005/v28i2/003.
- ^ See for a detailed geologic timescale Gradstein et al. (2004)
- ^ "International Stratigraphic Chart v2021/05". Archived from the original on 2021-06-05. Retrieved 2021-07-29.
- ^ Tong T, Shih CK, Ren D (2019). "A new genus and species of Stenurothripidae (Insecta: Thysanoptera: Terebrantia) from mid-Cretaceous Myanmar amber". Cretaceous Research. 100: 184–191. doi:10.1016/j.cretres.2019.03.005.
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