quaternary


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

quaternary

1. Chem containing or being an atom bound to four other atoms or groups
2. Maths having four variables

Quaternary

1. of, denoting, or formed in the most recent period of geological time, which succeeded the Tertiary period nearly two million years ago
2. the. the Quaternary period or rock system, divided into Pleistocene and Holocene (Recent) epochs or series

Quaternary

[′kwät·ən‚er·ē]
(geology)
The second period of the Cenozoic geologic era, following the Tertiary, and including the last 2-3 million years.
References in periodicals archive ?
1982, Correlation of the Quaternary terrace sequence in the Lower Rhine valley and northern Alpine Foothills of Central Europe, Quaternary Research, 18, 152-173.
The climatic cycles of the Quaternary show periodicity related to Milankovitch orbital variations, but paleotemperature estimates from Antarctic ice cores show a strong correlation with abundance of carbon dioxide in the cores.
As part of the VII Congress of the International Association for Quaternary Research, held in Boulder, Colorado, in 1965, Dave organized a symposium on The Late Cenozoic History and Environments of the Bering Land Bridge.
His studies (published in a total of 218 papers) involved Quaternary geology, stratigraphy and lithology of Palaeozoic rocks, palaeontology, applied geology, geomorphology and dynamic geology, hydrogeology, meteoritics, neotectonics, marine geology, history of geology, and other topics.
A typical quaternary ammonium salt is again specified, but the level is lower, 2-4% on silica.
The subject of this vz is the implementation of construction works leading to the correction of old ecological burdens after oil extraction in south moravia under the responsibility of the state, In vi chopav quaternary of the morava river.
The investigators were less rigid in the distinction between tertiary and quaternary levels, as these patients are managed in the same centre and require access to similar resources.
10, 17] found that the amount of quaternary nitrogen decreased during the mild pyrolysis (400 [degrees]C) of coals and increased in severe conditions of the process.
Results indicate the gold (Au) (up to 6 ppm) and base metals are found generally in higher concentration in panned concentrates as compared to that of stream sediments and Quaternary deposits.
Key Word: Fumigation, Effectiveness, Quaternary ammonium compounds, Formaldehyde.