This is literally beneath your feet.
This picture was taken on a trip to the National Parks in the South West of the States.
The place, including some of the deserts are covered with a reddish brown soil which will deposit on your shoes and trousers when you hike.
The feet/ shoe belong to my brother-in-law!
retireediary 
Perfect!
Thank you!
Looks like Sedona, Arizona. Went to school near there.
Keep up the great work, Michael. I always enjoy your blog.
–Nick Fox
Hi Nick, yes, it is Sedona. Thanks so much for your kind encouragement. Regards, Michael