There are a lot of such dips as on my picture on a highway (N. Sandario Road) to Saguaro National Park.
I heard that sometimes (usually in spring) there are heavy storms in that area with a lot of rain in short time. The rocky, desert earth can't absorb the large quantity of water and lower areas like dips on a highway are flooded. More: they are just "sculptured" (erosion) by fast flowing water during short but heavy rain falls.
My top 2 surprised observations from deserts at all:
1. Deserts are cold areas at night!
2. There are floods on a desert!
Marana is one of the hottest place in the USA, especially from May to October.
Looking for a parking lot in business area at exit 236 on I-10 you will not find any shadowed place.
Hmm... not so bad in April but in summer... I even can't imagine. My Buick would boil probably there (me as well :-).
It is not so easy to take a good picture in sunny day (are they others?) in Marana.
First of all there are BIG contrasts between sun-lighted areas and shadows.
My top 5 advices:
1. avoid taking pics in midday, better just after sunrise or before sunset,
2. avoid making pictures with objects of large contrast (white and black) - enlarge my picture to see such pic,
3. use sun filters if possible,
4. use manual white-black balance if possible and if you know how to do it hehe,
5. keep smiling :-))) and follow the links below.
- Digital Photography Review - the world's best internet service on digital cameras;
- ShortCourses - a complete guide to digital cameras, digital photography, and digital video;
- Digital Photography. The Textbook - for beginners in photography,
- photo.net - one of the world's largest photo portals online.
Have a great fun :-)