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单词 quaternary period
释义

Quaternary period


Quaternary period

The second (present) period of the Cenozoic era: 2 million to the present.
Thesaurus
Noun1.Quaternary period - last 2 million yearsQuaternary period - last 2 million years Age of Man, QuaternaryAge of Mammals, Cenozoic, Cenozoic era - approximately the last 63 million yearsHolocene, Holocene epoch, Recent, Recent epoch - approximately the last 10,000 yearsPleistocene, Pleistocene epoch, Glacial epoch - from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution

Quaternary period


See also: Geologic Timescale (table)Geologic Timescale
Era Period Epoch Approximate duration
(millions of years)
Approximate number of years ago
(millions of years)

Cenozoic Quaternary Holocene 10,000 years ago to the present 
Pleistocene 2 .
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Quaternary period

(kwətûr`nərē), younger of the two geologic periods of the Cenozoic eraCenozoic era
, last major division of geologic time (see Geologic Timescale, table) lasting from 65 million years ago to the present. The Cenozoic is divided into the Tertiary (from 65 million years ago until 2 million years ago) and Quaternary (2 million years ago to the
..... Click the link for more information.
 of geologic time (see Geologic TimescaleGeologic Timescale
Era Period Epoch Approximate duration
(millions of years)
Approximate number of years ago
(millions of years)

Cenozoic Quaternary Holocene 10,000 years ago to the present 
Pleistocene 2 .
..... Click the link for more information.
, table) from 2 millon years ago to the present. Comprising all geologic time from the end of the Tertiary periodTertiary period
, name for the major portion of the Cenozoic era, the most recent of the geologic eras (see Geologic Timescale, table) from around 26 to 66 million years ago. The name Tertiary was first applied about the middle of the 18th cent.
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 to the present, it is divided into the PleistocenePleistocene epoch
, 6th epoch of the Cenozoic era of geologic time (see Geologic Timescale, table). According to a classification that considered its deposits to have been formed by the biblical great flood, the epoch was originally called the Quaternary.
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 and HoloceneHolocene epoch
or Recent epoch,
most recent of all subdivisions of geologic time, ranging from the present back to the time (c.11,000 years ago) of almost complete withdrawal of the glaciers of the preceding Pleistocene epoch.
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, or Recent, epochs. It was named (1759) by Giovanni Arduino, an Italian scientist who thought that the biblical great flood was responsible for its deposits. During the early Quaternary, Europe and North America were covered by the glaciers of the Pleistocene epochPleistocene epoch
, 6th epoch of the Cenozoic era of geologic time (see Geologic Timescale, table). According to a classification that considered its deposits to have been formed by the biblical great flood, the epoch was originally called the Quaternary.
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. Retreat of the glaciers led to isostatic rebound (see continentcontinent,
largest unit of landmasses on the earth. The continents include Eurasia (conventionally regarded as two continents, Europe and Asia), Africa, North America, South America, Australia, and Antarctica.
..... Click the link for more information.
) of the crust in the Holocene. In the Quaternary the climate and present physical features of the earth continued to develop. Significant changes in sea level within historic times are demonstrated by the submergence of the temple of Jupiter Serapis near Naples and by the rising of the shores of the Baltic. The life of the Quaternary has been marked by the rise and dominance of humans.

Quaternary period


Quaternary period

the last two million years of the Cenozoic Era, from 2 million years BP (the end of the Tertiary) to the present time. During this period the increase in the human population has had significant effect on the populations of both other animals and plants.

Quaternary period


Related to Quaternary period: Tertiary period, Neogene Period
  • noun

Synonyms for Quaternary period

noun last 2 million years

Synonyms

  • Age of Man
  • Quaternary

Related Words

  • Age of Mammals
  • Cenozoic
  • Cenozoic era
  • Holocene
  • Holocene epoch
  • Recent
  • Recent epoch
  • Pleistocene
  • Pleistocene epoch
  • Glacial epoch
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更新时间:2025/2/22 14:15:23