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The almost white colour of Ayers Rock is coated by mostly iron-clay orange accretions, facilitating photogenic displays.

Dramatic sandstone escarpment faces of the Colorado Plateau in such places as Monument Valley are frequently coated by a reddish-brown silica glaze formed inside the unopened joint fracture and then exposed by block wasting. Rock coatings change the appearance of bare rock landforms.

Desert varnish is a commonly occurring feature on surface rocks of stable landforms in arid regions.

The objectives of this study were to investigate how desert varnish is related to the properties of the rocks on which it forms and how varnish is related to landform surface age and stability.

But these rates were based on radioactive dates for geomorphic features.


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