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The Great Unconformity

7/26/2018

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There is a gap in the rock record between Cambrian times and pre-Cambrian, 550 million years ago. An unconformity is a surface in the rock record in a stratigraphic column representing a time from which no rocks were preserved or formed, or when rocks were formed buy eroded away. 

Small unconformities are ubiquitous in the rock record. But the Great Unconformity is important because it represents a long period of time (250-1200 million years in the Grand Canyon), and it is found nearly everywhere in the world. 

​And it divides rocks with familiar fossils from those with no fossils or only fossil bacteria. 

​Below, you will find the Great Unconformity at the bottom of the blue layer.

Picture
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  • Home
  • Grand Canyon
    • Favorite places
    • Colorado Plateau
    • John Wesley Powell
    • Natives
    • Ecosystem
    • Clarence Dutton
    • Fred Harvey Company
  • Monument Valley
    • Navajo History
  • Zion
    • History
  • Bryce Canyon
    • Bryce Geology
    • History of Bryce
    • Southern Paiute
  • Capitol Reef
    • Fruita
  • Arches
    • Arches History
    • Animals
  • Canyonlands
    • The Animals
    • The People
    • The Vegetation
    • Canyonlands geology
  • Lake Tahoe
    • History
    • Sierra Nevada
  • Yosemite
    • History
    • Geology
    • Climate
    • Buffalo Soldiers
  • Kings Canyon
    • History
    • Geography
    • Geology
    • Sequoias and Redwoods
  • Death Valley
    • Diversity
    • The Lost 49ers
    • Burros
    • The Legend
  • Civilian Conservation Corps
    • Zion CCC
  • Salt Lake Valley