On our way home from Yellowstone and the Tetons, we stopped at Valley of Fire State Park north-east of Las Vegas.
Looks like a skull to me...
I use this blog to try to document our travels. We have been able to visit many amazing places with incredible things to see and photograph. Please take a look. Clicking on images in the posts will bring up a larger version. I try to insure that all images will contain embedded EXIF data.