Quaternary

Quaternary, Third and current period of the Cenozoic Era 2.59–0 million years ago.

Quaternary image

Quaternary ( kwə-TUR-nə-ree, KWOT-ər-nerr-ee) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.588 ± 0.005 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.588 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today). The informal term "Late Quaternary" refers to the past 0.5–1.0 million years.The Quaternary Period is typically defined by the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused. Research history In 1759 Giovanni Arduino proposed that the geological strata of northern Italy could be divided into four successive formations or "orders" (Italian: quattro ordini).

Quaternary extinction
3 months ago

Quaternary extinction ... The Quaternary period (from 2.588 ± 0.005 million years ago to the present) has seen the extinctions of numerous predominantly megafaunal species, which...

Quaternary ammonium cation
4 months ago

Quaternary ammonium cation ... Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR+ 4, R being an alkyl group or an aryl group...

Quaternary (disambiguation)
3 months ago

Quaternary (disambiguation) ... fourth geologic time period Quaternary glaciation, the current ice age Quaternary numeral system (base-4) in mathematics Quaternary Communications Encoding...

Quaternary (EP)
3 months ago

Quaternary (EP) ... Quaternary is an EP by the heavy metal band Mötley Crüe. It was released in 1994 on Elektra. The EP, which was initially going to be titled Leftovers,...

Quaternary prevention
3 months ago

Quaternary prevention ... The quaternary prevention, concept coined by the Belgian general practitioner Marc Jamoulle, are the actions taken to identify a patient at risk of overmedicalisation...

Quaternary glaciation
3 months ago

Quaternary glaciation ... Quaternary glaciation, also known as the Pleistocene glaciation, is an alternating series of glacial and interglacial periods during the Quaternary period...

Quaternary sector of the economy
5 months ago

Quaternary sector of the economy ... The quaternary sector of the economy is based upon the economic activity that is associated with either the intellectual or knowledge-based economy. This...

Holocene
5 months ago

Holocene ... retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period...

Quaternary compound
3 months ago

Quaternary compound ... a quaternary compound is a compound consisting of exactly four chemical elements. In another use of the term in organic chemistry, a quaternary compound...

Neogene
5 months ago

Neogene ... Period 23.03 million years ago (Mya) to the beginning of the present Quaternary Period 2.58 Mya. The Neogene is sub-divided into two epochs, the earlier...

Postgraduate education
4 months ago
Tertiary color
3 months ago
Quaternary numeral system
4 months ago
Protein quaternary structure
3 months ago
Neuromuscular-blocking drug
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Alkaline copper quaternary
3 months ago
Nucleic acid quaternary structure
3 months ago
Ice age
1 month ago
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