Libya
Title: Pillar ArchCanon EOS 1Ds MkII
Pillar Arch (38)
Jamesp Gold Star Critiquer/Gold Note Writer [C: 1369 W: 9 N: 6334] (18906)
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To vanderschelden: Varnish Jamesp Gold Star Critiquer/Gold Note Writer [C: 1369 W: 9 N: 6334] (18906)::2008-09-09 22:39
Hi ANnick

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.

James
Re: To vanderschelden: Varnish vanderschelden Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2553 W: 74 N: 7464] (30441)::2008-09-10 11:50
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...
Thanks
Annick