desert varnish
desert polish

In places the desert varnish had slipped away, and what stories might have been written there, lost.

In black desert varnish, however, manganese is 50 to 60 times more abundant.

"Oh, and look at that beautiful desert varnish on the sandstone.

Desert varnish collects on the exposed surface rocks over time.

The rocks glistened with desert varnish, smooth as mirrors.

They seemed to be loosely cemented in place by a coating of some form of desert varnish.

The thinnest crusts are known as desert varnish.

Desert varnish is usually around one micron thick and represents nanometre-scale layering.

An important characteristic of black desert varnish is that it has an unusually high concentration of manganese.

The petroglyphs here are made possible because many of the rocks in these arid conditions have desert varnish on them.

Geological features in these canyons include spires, windows, giant alcoves and desert varnish.

On the cliffs here he found an array of petroglyphs cut through the black desert varnish into the sandstone.

Even though it contains high concentrations of iron and manganese, there are no significant modern uses of desert varnish.

The pictures at Newspaper Rock were inscribed into the dark coating on the rock, called desert varnish.

Petroglyphs are incised or chiseled onto a patina known as desert varnish.

Other figures, including those of animals, have been incised by removal of the rock's covering of desert varnish.

The local granodiorite is naturally a very light color, weathering over centuries into a reddish-orange desert varnish.

Slick desert varnish, a shiny rust-brown veneer over cream-colored sandstone, coated the route above.

The canyon walls rise in layers of red shale, blue-gray limestone and sandstone - either buff or dark brown with desert varnish.

Desert varnish forms only on physically stable rock surfaces that are no longer subject to frequent precipitation, fracturing or wind abrasion.

Desert pavement surfaces are often coated with desert varnish which is a dark brown, sometimes shiny coating that contains clay minerals.

Moreover, the so-called 'desert varnish', which has a brown glint after oxidisation, has formed on them.

Sandstone rocks at Twyfelfontein are covered by the so-called desert varnish, a hard patina that appears brown or dark grey.

Water seeped through cracks in the sandstone walls, painting them with bacterial stains called desert varnish, nourishing ferns and wildflowers.

With Irina by his side, he sprinted down a wash that wound beneath a jutting overhang striped with desert varnish.