An Atlantean Fire-arm?
 
This is how the French palaeontologist Stephane Lwoff had interpreted one of the 1,500 Stone Age engravings from the site of La Marche, France. Lwoff sees something like a dancing violin player.   The bearded man wears a loose tunic, a hat, and interesting amulets around the neck. The man's genitals are protruding through an opening in the tunic. We also see a hatchet, which is affixed to the tunic.

What are we to make of the fact that the man's feet are in a straight line, as they would appear if they were planted flat on the ground?  Did Lwoff  just bypass this version? Let's check it out.

         
           Atlantean gunman

I believe that like this, the figure looks far more natural. I've also chosen to follow a less detailed, but more proportional head outline.
The right elbow bends at a right angle. There is continuity to some of the main lines separated by white spaces - For instance, the right forearm comes to another right-angled stop, but its outside line seems to resume a short distance below, this time as the hatchet My guess is that a square is indicated in the just described area, and with it some interesting underlying geometry. Meanwhile, the figure has acquired a  menacing appearance.  The stance is right out of a Hollywood western - a gunfighter in the process of drawing his gun. So, by the looks of it, we have a warrior, here. But, what is he doing? Looks like he is about to launch the bat like it was a javelin. Of course, bats are not made for throwing. However, with the change in our reading of the head, the warrior now seems to be looking into a scopelike device, rather than throwing it. Trick shooter looking into a mirror? 
What about his strange right-hand fingers? The hatchet is unconventional, too. It should be laced directly to the handle, but it is not.
Looking at the figure portrayed with both feet on the ground, my strongest impressioon is that of a gunman ready to draw. Indeed, the hatchet looks somewhat like a big handgun. Next, follow the inside line of the right arm from the funny finger up to the armpit and then down the side to the hatchet. This line is just like an outlined butt of a rifle, although one part of the line, which should be there is missing. However, it is quite possible that the line can be found on  the original engraving, but Lwoff had dismissed it as extraneous, in pursuing his interpretation.