I like how the petroglyph is the clear focus, but you give enough of a background to show how it fits into its surroundings. The green shrub gives it a nice color contrast as well.
More recent than some with a horse as a featured subject. The earliest date for that would have to be in the 1500's when the early Spanish explorers brought them north from Mexico.
There is an issue with Uploading Photos (attachjments). I am not sure what the problem is, and I am looking into it. You can still try to Create your Threads and Upload your Photos, but it is hanging up during the Upload.