Precambrian

Introduction
The Precambrian environment
- Paleogeography
- Paleoclimate
  - Evolution of the atmosphere and ocean
    - Oxygenation of the atmosphere
    - Development of the ocean
  - Climatic conditions
    - Temperature and rainfall
    - Worldwide glaciations
Precambrian life
- Microfossils and stromatolites
- Ediacaran fossils
Precambrian geology
- Major subdivisions of the Precambrian System
- Oldest minerals and rocks
- Significant geologic events
  - Distinctive features
  - Archean crustal growth
  - Proterozoic plate movements
- Occurrence and distribution of Precambrian rocks
- Archean rock types
  - Greenstone-granite belts
    - Economic significance of Archean greenstone-granite deposits
    - Greenstone-granite rock types
    - Structure and formation of greenstone-granite belts
    - Age and occurrence of greenstone-granite belts
  - Granulite-gneiss belts
    - Economic significance of Archean granulite-gneiss deposits
    - Granulite-gneiss rock types
    - Structure and occurrence of granulite-gneiss belts
    - Age and correlation of granulite-gneiss belts
  - Sedimentary basins, basic dikes, and layered complexes
- Proterozoic rock types
  - Basic dikes
  - Layered igneous intrusions
  - Shelf-type sediments
  - Ophiolites
  - Greenstones and granites
  - Granulites and gneisses
  - Orogenic belts
  - Glacial sediments
- Correlation of Precambrian strata
- Establishing Precambrian boundaries

References & Edit History Quick Facts & Related Topics

Images

Proterozoic Eon

Spriggina fossil

Precambrian bedrock of the Canadian Shield rising out of Reindeer Lake, on the border between northeastern Saskatchewan and northwestern Manitoba.

North West Leicestershire

Whaleback outcroppings of Precambrian granite of the basement complex in the Matopo Hills, southwestern Zimbabwe.

timeline of life on Earth

For Students

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Precambrian time summary

Precambrian: Facts & Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

Facts

Also Known As	pre-Phanerozoic time • Precambrian time

Photos

Proterozoic Eon

Spriggina fossil

Precambrian bedrock of the Canadian Shield rising out of Reindeer Lake, on the border between northeastern Saskatchewan and northwestern Manitoba.

North West Leicestershire

Whaleback outcroppings of Precambrian granite of the basement complex in the Matopo Hills, southwestern Zimbabwe.

timeline of life on Earth

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Topics

Archean Eon Proterozoic Eon Hadean Eon greenstone-granite belt Precambrian Eonothem Cryptozoic Eon Primary granulite–gneiss belt fossil Ediacara fauna Phanerozoic Eon Lipalian interval geochronology How Old Is Earth?era epoch period eon

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North America: Precambrian time

Key People

Sederholm

Jakob Johannes Sederholm

Finnish geologist