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Priscoan

A Dictionary of Zoology | 1999 | | Copyright

Priscoan In former geologic time scales, the first period of the Precambrian, covering the time from the formation of the Earth (about 4500 Ma ago) until the first appearance of life about 4000 Ma ago. The name has now been abandoned and this period now comprises the Hadean (4500–3800 Ma ago).

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MICHAEL ALLABY. "Priscoan." A Dictionary of Zoology. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Priscoan." A Dictionary of Zoology. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O8-Priscoan.html

MICHAEL ALLABY. "Priscoan." A Dictionary of Zoology. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Priscoan.html

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Priscoan

A Dictionary of Ecology | 2004 | | Copyright

Priscoan The earliest of the three subdivisions of the Precambrian, dated at about 4600–4000 Ma ago. It covers the time approximately from the formation of the Earth until the first appearance of life.

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MICHAEL ALLABY. "Priscoan." A Dictionary of Ecology. 2004. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Priscoan." A Dictionary of Ecology. 2004. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O14-Priscoan.html

MICHAEL ALLABY. "Priscoan." A Dictionary of Ecology. 2004. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O14-Priscoan.html

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Priscoan

A Dictionary of Earth Sciences | 1999 | | Copyright

Priscoan The first of the three subdivisions of Precambrian time, lasting from the formation of the Earth to 4000 Ma ago ( Harland et al., 1989), and followed by the Archaean. See also HADEAN.

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AILSA ALLABY and MICHAEL ALLABY. "Priscoan." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Priscoan." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O13-Priscoan.html

AILSA ALLABY and MICHAEL ALLABY. "Priscoan." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Priscoan.html

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Priscoan

A Dictionary of Plant Sciences | 1998 | | Copyright

Priscoan The earliest of the three subdivisions of the Precambrian, dated at about 4500–4000 Ma ago.

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MICHAEL ALLABY. "Priscoan." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Priscoan." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (June 1, 2012). http://www.encyclopedia.com/doc/1O7-Priscoan.html

MICHAEL ALLABY. "Priscoan." A Dictionary of Plant Sciences. 1998. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-Priscoan.html

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