Supriya Ghosh (Editor)

Bright Angel Shale

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Type
  
Geological formation

Overlies
  
Tapeats Sandstone

Unit of
  
Tonto Group

Primary
  
Slate

Underlies
  
Muav Limestone

Bright Angel Shale assetemsoflcomONLINE20CLASSEarthScilabdata

Thickness
  
500 feet (150 m) at its maximum

Other
  
sandstone and glauconitic sandstone

Region
  
northern Arizona, southeast California, southern Nevada, and southcentral Utah

Country
  
United States of America

Named for
  
Bright Angel Canyon, Bright Angel quadrangle, Coconino Co., Arizona

Carl with bright angel shale


The Cambrian Bright Angel Shale is the middle member of the 3-member Tonto Group. It is about 500 feet (152 m) thick at its maximum. It is a nonresistant slope-forming unit. The Bright Angel Shale consists of green and purple-red, siltstone and shale which is interbedded with red-brown to brown sandstone that is similar in lithology to the underlying Tapeats. The Bright Angel Shale underlies and interfingers with Muav Limestone. The Bright Angel Shale is located in the lower elevations of the Grand Canyon, Arizona.

Contents

Bright Angel Shale Bright Angel Shale

Geologic sequence

The units of the Tonto Group:

  • (1)-Temple Butte Limestone, Devonian-(409-363 Ma), channel deposits upon Muav Limestone
  • Tonto Group (~544-505 Ma)
  • 3-Muav Limestone
  • 2-Bright Angel Shale
  • 1-Tapeats Sandstone
    • Bright Angel Shale Spring in Bright Angel Shale East Clear Creek Grand Canyon Arizona

  • Blakey, Ron and Wayne Ranney, Ancient Landscapes of the Colorado Plateau, Grand Canyon Association (publisher), 2008, 176 pages, ISBN 978-1934656037
  • Chronic, Halka. Roadside Geology of Arizona, Mountain Press Publishing Co., 1983, 23rd printing, pp. 229–232, ISBN 978-0-87842-147-3
  • Lucchitta, Ivo, Hiking Arizona's Geology, 2001, Mountaineers's Books, ISBN 0-89886-730-4

    • Bright Angel Shale Nice view of the Bright Angel Shale

    Bright Angel Shale Geology of National Parks

    Bright Angel Shale Bright Angel Shale Grand Canyon

    Bright Angel Shale Grand Canyon Panorama Project Bright Angel Shale

    References

    Bright Angel Shale Wikipedia
    (Text) CC BY-SA