Precambrian


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Pre·cam·bri·an

 (prē-kăm′brē-ən, -kām′-)
adj.
Of, relating to, or being the geologic time period between Hadean Time and the Cambrian Period, often subdivided into the Archean and Proterozoic Eras, comprising most of the earth's history and marked by the appearance of primitive forms of life. See Table at geologic time.
n.
The Precambrian Eon.

Precambrian

(priːˈkæmbrɪən) or

Pre-Cambrian

adj
(Geological Science) of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period
n
(Geological Science) the Precambrian the Precambrian era. See Archaeozoic, Proterozoic

Pre•cam•bri•an

or Pre-Cam•bri•an

(priˈkæm bri ən, -ˈkeɪm-)
adj.
1. noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas.
n.
2. the Precambrian Era.
[1860–65]

Pre·cam·bri·an

(prē-kăm′brē-ən, prē-kām′brē-ən)
The span of geologic time between Hadean Time and the Phanerozoic Eon, from about 3.8 billion to 540 million years ago. During the Precambrian Eon, which is divided into the Archean and Proterozoic, primitive forms of life first appeared on Earth. See Chart at geologic time.

Precambrian

The period containing all of Earth’s history before the Cambrian period.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.Precambrian - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
Proterozoic, Proterozoic aeon, Proterozoic eon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Archaeozoic, Archaeozoic aeon, Archean, Archean aeon, Archean eon, Archeozoic, Archeozoic eon - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Translations
References in periodicals archive ?
My overall objective is to develop and refine new ways of extracting information from remarkably preserved Precambrian organic material and the minerals that host it.
These targets include formations within Precambrian -- Cambrian units, many of which contain hydrocarbons at the analog Khazzan -- Makarem Field in central Oman currently under development by BP as presented at the Gas Arabia Summit, December 2011.
Origin and evolution of Precambrian high-grade gneiss terranes, with special emphasis on the Limpopo complex of Southern Africa.
Windley has been a hugely influential "pioneer in the application of uniformitarianism to Precambrian rocks, a leader in linking field geology with the geochemistry and geochronology of different orogenic units with global tectonic history, and an overall polymath who has had a deep influence on many fields of geological science" (from the preface).
It would have landed in the ancient Precambrian sea, which covered the Midlands at the time, producing choking dust clouds and plumes of steam, which settled and formed into rock.
The text examines "Darwin's dilemma," the lost history of the origin of animal life in the Precambrian time.
New achievements in the Precambrian geology in general and especially in the geology of the Fennoscandian--Baltic region enable development of a new insight into the history of the formation of the basement rocks.
The finding is significant, because similar fossil grooves and furrows found from the Precambrian era, as early as 1.
wishes to advise that Pemberton Gage 10-15-82-3W6M was successfully drilled into the Precambrian basement to a final total depth of 2395.
14]C/C ratios drawn from the 90 studies summarized by Giem, one for non-biological Precambrian samples and one for biological Phanerozoic samples.
Other durable but pliable organic materials, such as protist resting cysts, are important parts of the Precambrian fossil record, up to 2 billion years old.
In this context, the Precambrian rocks of the Canadian Shield, known for their numerous metal and diamond deposits, offer favourable prospects for future mineral exploration.