After a regulation Moab cappuccino granola banana nut pancake breakfast, we visited the lower, south part, of Canyonlands. My dirt road driving non-abilities (and James reluctance to let me dent the rental car) stopped us visiting the actual Needles up close, but there was, nevertheless, some impressive geology.
In the visitor centres to these places there are fanciful hand-wavey tales of oceans going in and out, and things being uplifted and tilted and eroded. Note layers of white pillows which were once, apparently, sand dunes, interspersed with what was once, um, red mud stuffs.
I suppose we were there at the driest time of year. The signs indicated that the eroded hollows in the surface usually contain water.
Finally, the answer to one of life's great questions: meteorology + geology = art !