Proterozoic

  

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Proterozoic

Definition: Proterozoic

Proterozoic

Adjective

1. (geology) formed in the later of two divisions of the Precambrian era; "proterozoic life forms".

Noun

1. From 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms.

Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.
 


Synonym: Proterozoic

Synonym: Preoterozoic era (n). (additional references)

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Specialty Definition: Proterozoic

(From Wikipedia, the free Encyclopedia)

 This era is the sole period
of the Precambrian eon.
 Proterozoic

In geology, the Proterozoic is an era prior to the first abundant complex life on earth.

Classically, the boundary between the Proterozoic and the Paleozoic was set at the base of the Cambrian period when the first fossils of animals known as trilobites and archeocyathids appeared. In the second half of the 20th century, a number of fossil forms have been found in Precambrian rocks, but the boundary of the Proterozoic has remained fixed at the base of the Cambrian -- currently thought to be around 545 Million years before the present.

Proterozoic consists of 5 geologic periods called, from oldest to youngest:

The Hadean is thought to occupy the time from 4500Ma to 3800Ma. Conditions in that time span are subject to considerable debate. The debate extends into the early Archaean, however it is clear that by roughly 3600Ma temperatures were stable at near modern levels, continental crusts were in place, oceans of liquid water existed, and simple lifeforms either had appeared or would appear shortly. Conditions of that sort existed throughout most of the remaining Proterozoic. The major well identified events were the transition to an Oxygenated atmosphere that probably occurred in the Mesoproterozoic and several glaciations the most severe of which took place in the late Neoproterozoic.

Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Proterozoic."

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Synonyms within Context: Proterozoic

ContextSynonyms within Context (source: adapted from Roget's Thesaurus).

Oldness

Archeozoic, Proterozoic,

Source: adapted from Roget's Thesaurus.

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Crosswords: Proterozoic

Specialty definitions using "proterozoic": geology system ♦ Keweenawan. (references)

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Commercial Usage: Proterozoic

DomainTitle

Books

  • Early Proterozoic Geology of the Great Lakes Region (reference)

  • Proterozoic East Gondwana: Super Continent Assembly and Break-Up (reference)

  • Proterozoic Geology: Selected Papers from an International Proterozoic Symposium (reference)

  • The Pan-African belt of northeast Africa and adjacent areas : tectonic evolution and economic aspects of a late Proterozoic orogen (reference)

  • The Proterozoic Biosphere : A Multidisciplinary Study (reference)

    (more book examples)

Source: compiled by the editor from various references; see credits.

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Usage Frequency: Proterozoic

"Proterozoic" is generally used as an adjective (general or positive) -- approximately 54.55% of the time. "Proterozoic" is used about 11 times out of a sample of 100 million words spoken or written in English. Its rank is based on over 700,000 words used in the English language. Some parts-of-speech are not covered due to the samples used by the British National Corpus. (note: percents less than one-hundredth of one percent have been omitted)
Parts of SpeechPercentUsage per
100 Million Words		Rank in English
Adjective (general or positive)54.55%6143,867
Noun (singular)45.45%5157,705
                    Total100.00%11N/A

Source: compiled by the editor from several corpora; see credits.

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Frequency of Internet Keywords: Proterozoic

The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com.
 
ExpressionFrequency
per Day

proterozoic

4

era proterozoic

4
Source: compiled by the editor from various references; see credits.

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Modern Translation: Proterozoic

Language Translations for "proterozoic"; alternative meanings/domain in parentheses.

Danish

  

proterozoikum. (various references)

   

Dutch

  

proterozoicum, Proterozoïcum. (various references)

   

Esperanto

  

Proterozoiko. (various references)

   

French

  

protérozoique. (various references)

   

German

  

Proterozoikum. (various references)

   

Italian

  

proterozoico, archeano. (various references)

   

Pig Latin

  

oterozoicpray

   

Russian 

  

протеозойский. (various references)

Source: compiled by the editor from various translation references.

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Anagrams: Proterozoic

Scrabble® Enable2K-Verified Anagrams

Words within the letters "c-e-i-o-o-o-p-r-r-t-z"

-4 letters: crozier, pierrot, porrect, portico, preriot, proctor, rootier, trooper, zootier.

-5 letters: cooper, cooter, cootie, copier, copter, corrie, cozier, crozer, erotic, octopi, octroi, oozier, orrice, poetic, poorer, porter, potzer, pretor, pricer, prizer, protei, rector, report, rioter, rooter, ropier, torero, torpor, tropic.

Source: compiled by the editor from various references; see credits.

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INDEX

1. Definition
2. Synonyms
3. Crosswords
4. Usage: Commercial 		5. Usage Frequency
6. Expressions: Internet
7. Translations: Modern
8. Anagrams 		9. Bibliography


  

Copyright © Philip M. Parker, INSEAD. Terms of Use.