Pillar Arch (38)
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|To vanderschelden: Varnish ||Jamesp
The rock varnish forms on hard sandstones, especially the Navaho and Entrada sandtones in SW USA. This sandstone is very soft and eroding very quicky, so the varnish does not have time to form.
|Re: To vanderschelden: Varnish ||vanderschelden
|Thanks a lot.
Figured out it couldn't be the difference in pressure due to the temperature (day/night) as these differnces are probably similar or even more than the West coast conditions...