Alexis Bousiges of France has collected numerous rocks of anomalous nature in the Barstow, California area. Other fossil collectors in this area have found rocks on suspected cultural sites which appear to have evidence of human work and which may incorporate simple imagery.
Illustration by Alexis Bousiges of human flake removal from original core. "What we have here is a "fragment" of a Crystal-Agate geode. Due to its form, we can imagine how the original rock looked."
On the blog Paleoface, Alexis writes "This fragment was found "As Is" on the same paleo site where the other pieces have been found. So, this little fragment was certainly "extracted" by a man... AND retouched, as the picture below is showing you:"
"Finally, here is what the man wanted to represent, the profile of a man's face on each side." -photos, illustrations and analysis courtesy Alexis Bousiges, France.
link to Paleoface site of Alexis Bousiges