Geological Era

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Related to Geological Era: Geological time scale
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Era, Geological


an interval of time in the earth’s geological history, during which an erathem formed. Eras are subdivided into periods; several eras combine to form an eon. There are three eras in the most recent Phanerozoic eon: the Paleozoic, Mesozoic, and Cenozoic eras. (See alsoGEOCHRONOLOGY.)

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Each landing site highlights a different geological era of the planet.
It seems an anomaly on a massive scale to think that hippies used to pay good money at the end of the sixties to listen to guitar solos that started in one geological era and finished in another, or to witness a drum solo that sounded like the congress of tortoises on Viagra.
Thus in Marmagne the unfathomably distant time of a remote geological era merges with the infinitesimal, with the minimal and imperceptible time of the slow, everyday mutation of things: a passing cloud, dry twigs floating by, a flower, the ruffling of the surface, the nature that lines the water sinking into the vegetation filling one of the basins.
Hardrock mining exposes rock that has lain unexposed for geological eras. When crushed, these rocks expose radioactive elements, asbestos-like minerals, and metallic dust.
The artist and his instruments of torture immensely accelerate the imperceptible transformations that take place over geological eras, until each is made visible to the human eye.
Since the appearance of visible life on Earth, 380 million years had to elapse in order for a butterfly to learn how to fly, 180 million years to create a rose with no other commitment than to be beautiful, and four geological eras in order for us human beings to be able to sing better than birds, and to be able to die from love.
The Cenozoic Era is the current and most recent of the three Phanerozoic geological eras, following the Mesozoic Era and covering the period from 66 million years ago to the present.
THE TOPIC: For tens of thousands of years--as geological eras go, up until just "yesterday"--people organized themselves into small groups of hunter-gatherers, each of which developed its own methods for surviving under harsh conditions.
Millions and millions of gallons have been drawn out from the well, the source originating from the bedrock formed during early geological eras.
Evidence exists in the layers of black shale that mark the extinction events at the boundaries between geological eras. Such deposits are formed only when the seas become anaerobic, like the deep waters of today's Black Sea.

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