Look up: Precambrian

1. Precambrian
   A geological term denoting the time in Earth history prior to 570 million years ago.
   Found on http://www.solarviews.com/eng/terms.htm
   
   
2. Precambrian
   The Precambrian is the geological time period before the Cambrian period (before 540 million years ago). It is the time period from when the Earth formed until simple life-forms evolved.
   Found on http://www.enchantedlearning.com/subject
   
   
3. Precambrian
   [n] - the geological era before about 544 million years ago
   Found on http://www.webdictionary.co.uk/definitio
   
   
4. Precambrian
   Precambrian eon noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
   Found on http://wordnet.princeton.edu/perl/webwn?
   
   
5. Precambrian
   The `Precambrian` (`Pre-Cambrian`) is an informal name for the supereon comprising the eons of the geologic timescale that came before the current `Phanerozoic` eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution of abundant macroscopic hard-shelled animals, which marked the beginning of the Cambrian, the first period of the first era of the Phanerozoic eon, some 542 Ma. It is named after the Roman name f...
   Found on http://en.wikipedia.org/wiki/Precambrian
   
   
6. Precambrian
   The `Precambrian` (`Pre-Cambrian`) is an informal name for the supereon comprising the eons of the geologic timescale that came before the current `Phanerozoic` eon. It spans from the formation of Earth around 4500 Ma (million years ago) to the evolution of abundant macroscopic hard-shelled animals, which marked the beginning of the Cambrian, the first period of the first era of the Phanerozoic eon, some 542 Ma. It is named after the Roman name f...
   Found on http://en.wikipedia.org/wiki/Precambrian
   
   
7. Precambrian
   Span of geologic time that dates from 4.6 billion to 570 million years ago. Made up of three geologic eras: Hadean, Archean, and Proterozoic.
   Found on http://www.physicalgeography.net/physgeo
   
   
8. Precambrian
   Credit: US Geological Survey The earliest and longest period of geologic time, extending from the formation of the Earth (4.5 billion years ago) to about 543 million years ago when the Paleozoic era began. The Precambrian accounts for about 90% of geologic time. It has been divided according to...
   Found on http://www.daviddarling.info/encyclopedi