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- The Cambrian Bright Angel Shale is the middle layer of the three member Tonto Group geologic feature. The 3-rock Tonto section famously sits upon the Great Unconformity because of the highly resistant cliffs of the base layer, vertical Tapeats Sandstone cliffs. The Bright Angel Shale is easily identified for two reasons. Its soft-greenish color stands out against the browns, reds, and whites of neighboring rock units. And secondly for its slope-forming character against mostly cliff-forming resistant rocks. The Bright Angel Shale 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 Sandstone. 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. The units of the Tonto Group and the colorful Bright Angel Shale are easily identified as a geological sequence beneath the tall cliffs of the Redwall Limestone (the Redwall sits upon a short resistant cliff of Muav Limestone); the Tonto Group is also easily seen beside Granite Gorge of the Colorado River and the Vishnu Basement Rocks The units of the Tonto Group:
* 5 – Frenchman Mountain Dolostone
* 4 – Muav Limestone
* 3 – Bright Angel Shale
* 2 – Tapeats Sandstone (start of transgression series)
* 1 – Sixtymile Formation (en)
- Die Bright-Angel-Formation ist die dritte Formation der kambrischen Tonto Group im Südwesten der Vereinigten Staaten. Sie wurde im Miaolingium als Teil der (Sauk II) abgelagert und zeichnet sich durch eine das ästuarine Sediment durchwühlende Ichnofazies aus. (de)
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- 8031 (xsd:nonNegativeInteger)
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- Canyon into Granite Gorge (en)
- Isis Temple (en)
- View from Komo Point Trail (en)
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- Relative long distance photo of Isis Temple (en)
- Muav Limestone – and Bright Angel Shale , resting on Tapeats Sandstone , inner canyon, Granite Gorge. (en)
- The entire Tonto Group 3-unit sequence is visible above the Colorado River (en)
- -Sloping Supai Group redbeds upon Redwall Limestone cliffs and horizontal platforms on the Muav Limestone on -greenish of Bright Angel Shale (en)
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- Bright Angel Shale sites (en)
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- Komo Point view - Flickr - brewbooks.jpg (en)
- Pan 8 of 8 - Komo Point - Flickr - brewbooks.jpg (en)
- USA 09855 Grand Canyon Luca Galuzzi 2007.jpg (en)
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- Bright Angel Canyon, Bright Angel quadrangle, Coconino Co., Arizona (en)
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- sandstone and glauconitic sandstone (en)
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- micaceous siltstone and shale (en)
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- northern Arizona, southeast California, southern Nevada, and southcentral Utah (en)
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- Die Bright-Angel-Formation ist die dritte Formation der kambrischen Tonto Group im Südwesten der Vereinigten Staaten. Sie wurde im Miaolingium als Teil der (Sauk II) abgelagert und zeichnet sich durch eine das ästuarine Sediment durchwühlende Ichnofazies aus. (de)
- The Cambrian Bright Angel Shale is the middle layer of the three member Tonto Group geologic feature. The 3-rock Tonto section famously sits upon the Great Unconformity because of the highly resistant cliffs of the base layer, vertical Tapeats Sandstone cliffs. The Bright Angel Shale is easily identified for two reasons. Its soft-greenish color stands out against the browns, reds, and whites of neighboring rock units. And secondly for its slope-forming character against mostly cliff-forming resistant rocks. The units of the Tonto Group: (en)
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- Bright-Angel-Formation (de)
- Bright Angel Shale (en)
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