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looking via the canyon cuts to the Echo Cliffs monocline. The Echo Cliffs are a prominent geological feature in northern Arizona. The cliffs stretch for 70 miles and reach over 1000 feet high. Prominently exposed in the cliffs are the Chinle Formation of the Colorado Plateau. Its rocks are of the Glen Canyon Group above and the Moenkopi Formation below.
https://pubs.geoscienceworld.org/aeg/ee ... n-and-Echo Large rotational block landslides mantle the erosional escarpment along most of its extent. Although these landslides have been noted for over 100 years, their likely origin has never been explained. Landslide failure surfaces appear to be influenced by the Petrified Forest Member of the Triassic Chinle Formation, a shale layer containing smectite clay weathered from volcanic ash.
https://pubs.geoscienceworld.org/aeg/ee ... n-and-Echo Large rotational block landslides mantle the erosional escarpment along most of its extent. Although these landslides have been noted for over 100 years, their likely origin has never been explained. Landslide failure surfaces appear to be influenced by the Petrified Forest Member of the Triassic Chinle Formation, a shale layer containing smectite clay weathered from volcanic ash.