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Quartary
The Quaternary is a geologic period. Quaternary (an adjective meaning "fourth in order" or "composed of four items") may also refer to: * Quaternary (chemistry) (see also Quaternary compound and Quaternary phase) * Quaternary structure of proteins * Quaternary sector of the economy, which encompasses knowledge-based services * Quaternary care, health care that includes highly specialized or experimental treatments * Quaternary numeral system (base-4) in mathematics * Quaternary counting system, as used in some human languages * ''Quaternary'' (EP), an album by Mötley Crüe See also * * * Quinary Quinary (base-5 or pental) is a numeral system with 5 (number), five as the radix, base. A possible origination of a quinary system is that there are five finger, digits on either hand. In the quinary place system, five numerals, from 0 (number) ..., positional number system with base 5 * Ternary (other) * Tertiary (other) {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaternary
The Quaternary ( ) 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 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today, although a third epoch, the Anthropocene, has been proposed but is not yet officially recognised by the ICS). 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" ( it, quattro ordini). The term "quaternary" was introduced by Jules Desn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
