Geologic period that occurred roughly 1.6 million years ago to today. During much of this period continental glaciers in the Northern Hemisphere covered large regions of land surface in the high and m [..]

Fourth in sequence or order

early 15c., "consisting of four parts," from Latin quaternarius "of four each, containing four," from quaterni "four each, by fours," from quater "four times," [..]

(2.5 million years ago-present) most recent period in geologic time.

The Quaternary is the geologic time period comprising about the last 1.65 million years.

a period of geologic time lasting from 1.6m years ago to the present.

fourth (pop)

the most recent geological era, from 2 million years ago to present. The Quaternary consists of Pleistocene and Recent periods. See time table.

the period of Earth's history from about 2 million years ago to the present. Rocks and deposits of that age may also be referred to as Quaternary deposits.

The period of geological time following the Tertiary (65 Ma to 1.8 Ma). Following the current definition (which is under revision at present) the Quaternary extends from 1.8 Ma until the present. It i [..]

(n) last 2 million years(n) the cardinal number that is the sum of three and one(adj) consisting of or especially arranged in sets of four(adj) coming next after the third and just before the fifth in [..]

(1) The youngest geologic period; includes the present time. (2) The latest period of time in the stratigraphic column, 0 - 2 million years, represented by local accumulations of glacial (Pleistocene) and post-glacial (Holocene) deposits which continue, without change of fauna, from the top of the Pliocene (Tertiary). The quaternary appears to be a [..]

An informal sub-era from 2.58 or 1.8 mya to today. The Quaternary is traditionally associated with the Holocene and Pleistocene, but an alternative definition sets its start during the cycle of glacials and interglacials around 2.6 mya. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z   - R -

The most recent Period of the Cenozoic Era. Encompasses the time interval of 1.6 million years ago through today.

The most recent Geological time period spanning the last 2.6 million years.

The period of Earth's history from about 2 million years ago to the present; also, the rocks and deposits of that age. [Organic Letters; v7; 1435; 2005.] [Journal of the American Chemical Society [..]

kwot-er-ner-ee Period of geological time about 1.64 million years ago.

consisting of or especially arranged in sets of four quarry water

Of fourth rank or order. ''the quaternary stress in a pronounced word'' Of a mathematical expression containing e.g. x⁴.

(geology) The geological period of the Cenozoic Era immediately following the Tertiary. It is subdivided into the Pleistocene and the Holocene Epochs.