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 ?
Financial costs can be limited if measures of quarternary treatment are restricted to selected large-scale wastewater treatment plants.
1942: Tertiary and Quarternary fossils from the Burica Peninsula of Panama and Costa Rica.
quarternary ammonium compounds [QACs]) can cause acute irritant symptoms, respiratory and skin sensitization, and asthma (3-5).
I currently have active research projects in the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Cretaceous, Paleogene, Neogene, and Quarternary geologic periods.
149-160, in Contributions in Quarternary Vertebrate Paleontology: A Volume in Memorial to John E.
Quarternary ammonium compound (1:5000), 45-70% alcohol, 1% soap, 5-7% iodine solution kills the rabies virus within one minute (35).
The downstream of Nyando escarpment is typified by lacustrine alluvial plains featuring smooth rolling surface marked by minor irregularities linked to the renewal of fluvial activity that commenced most probably in the late quarternary [2].
Outline of the history of Arctic and boreal biota during the Quarternary period.
There is no doubt that the study of glacial geomorphology can inform us about the climate changes that have taken place throughout the Quarternary Era.
When they were initially reported, the physical setting of the two Nanggu area Lapita sites (SZ-8, SZ-10) on Nendo were described as occurring in soils overlying coralline Quarternary limestone and were said to be "in very similar environments to the Lapita sites on the Main Reef Islands, despite the fact that Nendo is largely a volcanic high island" (Green 1976:250).
Neogene and Quarternary development of the neotropical rain forest: the forest refugia hypothesis, and a literature overview.
Pittsburgh, is a cationic quarternary ammonium salt.