Here are some from one of my visits to the Petrified Forest. The place is so cool, with so many interesting petrified rocks, but finding compelling compositions can be harder then one might first think. I was doing some work providing geology photos for text books, so I visited a lot of the National Parks and Monuments with that in mind. It was a fun project until the stock photo market really took off and the book publishers chose to just buy photos for pennies, even if the quality wasn't as good.
A wider view.
A closer view of some rocks that were once one.
Another set
And a close up
A wider view.
A closer view of some rocks that were once one.
Another set
And a close up