Hakatai Shale - Wikiwand
By A Mystery Man Writer
The Hakatai Shale is a Mesoproterozoic rock formation with important exposures in the Grand Canyon, Coconino County, Arizona. It consists of colorful strata that exhibit colors varying from purple to red to brilliant orange. These colors are the result of the oxidation of iron-bearing minerals in the Hakatai Shale. It consists of lower and middle members that consist of bright-red, slope-forming, highly fractured, argillaceous mudstones and shale and an upper member composed of purple and red, cliff-forming, medium-grained sandstone. Its thickness, which apparently increases eastwards, varies from 137 to 300 m. In general, the Hakatai Shale and associated strata of the Unkar Group rocks dip northeast (10–30°) toward normal faults that dip 60° or more toward the southwest. This can be seen at the Palisades fault in the eastern part of the main Unkar Group outcrop area. In addition, thick, prominent, and dark-colored basaltic sills and dikes cut across the purple to red to brilliant orange strata of the Hakatai Shale.
Geologic Time – Historical Geology
Hakatai Shale - Wikipedia
What is the natural history of the Grand Canyon? - Quora
The Earth Story - The Shinumo Quartzite and the foundation
Hakatai Shale - Wikipedia
Geology of the Grand Canyon area - Wikiwand
Great Unconformity, New Hance Trail, Grand Canyon by RichardEly on
Grand canyon - walk to Plateau Point, In the afternoon, I t…
The Geologic Column
Six bad arguments from Answers in Genesis (Part 5) – GeoChristian
Hakatai Shale - Wikipedia
