adj.
三次の、第三級の

関: third-order

WordNet

from 63 million to 2 million years ago (同)Tertiary_period

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(地質時代の)第三紀の / 《t-》第3[位]の / (地質時代の)第三紀

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2013/04/02 17:40:34」(JST)

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This article is about the geological term. For other uses, see Tertiary (disambiguation).

Events of the Cenozoic

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Neogene

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Miocene

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Paleocene

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Pliocene

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N. Amer. prairie expands^[1]

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First Antarctic permanent ice-sheets^[2]

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K-Pg mass
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Messinian salinity crisis^[3]

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Holocene begins 11.5 ka ago

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Cenozoic
Mesozoic

An approximate timescale of key Cenozoic events.
Axis scale: Ma before present.

Tertiary is an officially deprecated but still widely used term for a geologic period from 65 million to 2.6 million years ago, a time span that lies between the superseded Secondary period and the Quaternary. The Tertiary is no longer recognized as a formal unit by the International Commission on Stratigraphy,^[4] its traditional span being divided between the Paleogene and Neogene Periods of the Cenozoic Era.

The period began with the demise of the non-avian dinosaurs in the Cretaceous–Paleogene extinction event, at the start of the Cenozoic Era, spanning to the beginning of the most recent ice age at the end of the Pliocene Epoch. The Tertiary also included the early Pleistocene.

Historical use of the term

The term Tertiary was first used by Giovanni Arduino during the mid-18th century. He classified geologic time into primitive (or primary), secondary, and tertiary periods based on observations of geology in northern Italy.^[5] Later a fourth period, the Quaternary, was applied. In the early development of the study of geology, the periods were thought to correspond to the Biblical narrative, the rocks of the Tertiary being thought to be associated with the Great Flood.^[6] In 1828, Charles Lyell incorporated a Tertiary Period into his own, far more detailed system of classification. He subdivided the Tertiary Period into four epochs according to the percentage of fossil mollusks resembling modern species found in those strata. He used Greek names: Eocene, Miocene, Older Pliocene and Newer Pliocene. Although these divisions seemed adequate for the region to which the designations were originally applied (parts of the Alps and plains of Italy), when the same system was later extended to other parts of Europe and to America, it proved to be inapplicable. Therefore, the use of mollusks was abandoned from the definition and the epochs were renamed and redefined.

Geological events

Tectonic activity continued as Gondwana finally split completely apart, and India collided with the Eurasian plate. South America was connected to North America toward the end of the Tertiary. Antarctica — which was already separate — drifted to its current position over the South Pole. Widespread volcanic activity was prevalent.

Climate

Climates during the Tertiary slowly cooled, starting off in the Paleocene with tropical-to-moderate worldwide temperatures and ending before the first extensive glaciation at the start of the Quaternary.

References

^ Retallack, G.J. (1997). "Neogene Expansion of the North American Prairie". PALAIOS 12 (4): 380–390. doi:10.2307/3515337. JSTOR 3515337. Accessdate used without URL
^ Zachos, J.C.; Kump, L.R. (2005). "Carbon cycle feedbacks and the initiation of Antarctic glaciation in the earliest Oligocene". Global and Planetary Change 47 (1): 51–66. Bibcode:2005GPC....47...51Z. doi:10.1016/j.gloplacha.2005.01.001.
^ Krijgsman, W.; Garcés, M.; Langereis, C.G.; Daams, R.; Van Dam, J.; Van Der Meulen, A.J.; Agustí, J.; Cabrera, L. (1996). "A new chronology for the middle to late Miocene continental record in Spain". Earth and Planetary Science Letters 142 (3-4): 367–380. Bibcode:1996E&PSL.142..367K. doi:10.1016/0012-821X(96)00109-4.
^ International Stratigraphic Chart^{[dead link]}
^ Carl O. Dunbar, Historical Geology, 2nd ed. (1964), John Wiley & Sons, New York, p. 352
^ Rudwick, M.J.S (1992): Scenes from Deep Time: Early Pictorial Representations of the Prehistoric World, University of Chicago Press, 280 pages. Except from Google Books

Neogene Period
Miocene	Pliocene
Aquitanian \|Burdigalian Langhian \| Serravallian Tortonian \| Messinian	Zanclean \| Piacenzian

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