Wallpapering with rocks and dirt

Natural History Book from 1888
Originally uploaded by Valeriana Solaris.

A huge chunk of my time for the past couple of days has been spent reinstalling Windows. It turns out that one can save a lot of time doing it right the first time --who knew? But I have a cranky old laptop, and only moderate computer skills (and a life, with other things to do), so I've been stuck with my old Treo for internet use for awhile.

While I was looking for interesting replacement wallpaper (eagerly anticipating a switch either to a Mac or to Windows 7, so I can rotate wallpaper -- decisiveness isn't my forte, I'd rather rotate nice wallpaper than have to decide) I stumbled on this neat blog I'd never seen before:
Geological Musings in the Taconic Mountains and today's relevant post, Geology Desktop Images.

I haven't yet poked around on it (still setting up my laptop) but will as soon as I've truly up and running.