quaternary

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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 ?
However, when the initially alkaline pH is reduced in coagulation to deactivate the anionic surfactant stabilizing the rubber latex, the quaternary salt becomes an active surfactant again.
Their topics include contemporary climate and circulation of the tropics, tropical oceans, China and Southeast Asia, Latin America and the Caribbean, modeling tropical environments during the Quaternary, and historical environmental change in the tropics.
The decision has been made by the International Commission on Stratigraphy (ICS), the authority for geological science which has acted to end decades of controversy by formally declaring when the Quaternary Period, which covers both the ice age and moment early man first started to use tools, began.
The quaternary ammonium salt, TEBA alone was not at all active as the accelerator.
Inspired by the new results, several groups are now looking for even better codes, going beyond the quaternary digits to other sets of numbers.
Trigon reports that it conducted deep overburden sampling at Alliance last winter for the purpose of increasing its knowledge of the quaternary deposits in the region.
Among their topics are the quaternary sedimentology of the Arabian/Persian Gulf and its geological impact; re-evaluating the Holocene evolution of Arabian coastal sabkas based on stable-isotope analysis 40 years after Shearman's first view; the geochemistry and nature of organic matter of the Pleistocene-Holocene carbonate-evaporite sediments of Al-Khiran in southeastern Kuwait; the role of bacterial sulphate reduction in carbonate replacement of vanished evaporites with examples from the Holocene, Jurassic, and Neoarchaean; salt tectonics and structural styles of the western High Atlas and the intersecting Essaouira-Cap Tafelney segments of the Moroccan Atlantic margin; and the petroleum exploration challenge of carbonates and evaporites of the Upper Jurassic Arab Formation in Abu Dhabi.