Extensive groundwater supplies lie within Quaternary sediments.
Key quote - "Particularly exciting to me was the fact that these insect fossils showed that Quaternary climates had changed abruptly.
(The elimination of the Quaternary was vigorously—and, ultimately, successfully—resisted by Quaternary stratigraphers.)
The mysterious teeth, which had been sitting unidentified in museum drawers for more than 40 years, are the first evidence that highly adaptable wolf-sized hyenas were in the North American Arctic, according to the paper published in the journal Open Quaternary.
The Quaternary is one of the best-studied parts of the geologic record.
The Quaternary is replete with forces of disturbance and evidence for evolution in many living systems.
The northern part was subjected to several periods of glaciation throughout the Quaternary Period (the past 2.6 million years).
The most distinctive changes seen during the Quaternary were the advances of ice into temperate latitudes of the Northern Hemisphere.
The most distinguishing characteristics of the Quaternary in middle and high latitudes are glacial sediments and evidence of glacial erosion.
Quaternary, in the geologic history of Earth, a unit of time within the Cenozoic Era, beginning 2,588,000 years ago and continuing to the present day.
In economics, industries are generally classified as primary, secondary, tertiary, and quaternary; secondary industries are further classified as heavy and light.
Continental ice sheets formed and extended into temperate latitudes numerous times in the Quaternary, but the terrestrial record of these events is somewhat incomplete.
The selectivity sequence for halide ions in resins with quaternary-ammonium fixed ions is fluoride, chloride, bromide, and iodide, with fluoride being held the most weakly.
Of more importance to subsequent Quaternary events were the late Tertiary tectonic movements that affected the evolution of climate toward that of the Quaternary.
Throughout the Quaternary Period, erosive forces gnawed steadily at the enormous block of newly folded and upthrust mountains, forming the general outlines of the present-day landscape.
…during the Quaternary by Alpine glaciation and by expanding ice tongues, some reaching depths of nearly 1 mile (1.6 kilometres), that filled in the valleys and overflowed onto the plains.
Gelasian Stage, first of four stages of the Pleistocene Series, encompassing all rocks deposited during the Gelasian Age (2,588,000 to 1,806,000 years ago) of the Pleistocene Epoch in the Quaternary Period.
Each period is further divided into epochs: the Paleogene encompasses the Paleocene, Eocene, and Oligocene epochs; the Neogene comprises the Miocene and Pliocene epochs; and the Quaternary includes the Pleistocene and Holocene epochs.
As a result of the arid phases it underwent during the Quaternary period (2.6 million years ago to the present), the Mauritanian landscape in general presents three different aspects; these are represented by skeletal soils, regs (desert surfaces consisting of small, rounded, tightly packed pebbles), and dunes.
Dr Richard Staff, a research fellow in quaternary geochronology at the University of Glasgow said the study was exciting, and noted that it could lead to further investigation into the environmental and evolutionary effects of other, larger dramatic downturns in the Earth’s magnetic field strength further back in time.
- the cardinal number that is the sum of three and one
- consisting of or especially arranged in sets of four
- coming next after the third and just before the fifth in position or time or degree or magnitude
Example: the quaternary period of geologic time extends from the end of the tertiary period to the present
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Dr Richard Staff a research fellow in quaternary geochronology at the University of Glasgow said the study was exciting and noted that it could lead to further investigation into the environmental and evolutionary effects of other larger dramatic downturns in the Earths magnetic field strength further back in time