Here is a video featuring the head in left 3/4 profile seen in the 'anvil' discovered in a Paleolithic tool context by now Dr. Lowery. You may enter the video at 22:17 and get an introduction to this find by Dennis Stanford of the Smithsonian Institution.
The archaeological site has since been physically destroyed by the landowner. If the Smithsonian Institution or Dr. Lowery has the anvil stone, it should be evaluated as a possibly sculpted human head likeness.
It is also just as possible it was used as an anvil- it could have been a decorated tool incorporating iconography into a functional piece.
A piece like this may be seen as including a neutral or content facial expression and an expression of an unhappy one. This is seen in other examples on this blog.
The first may be interpreted as a content or even smiling face and the second on the reverse side may be interpreted as frowning or grimacing. (Click photos to expand.) It is my hypothesis this motif may be depicting the human condition before and after a symbolic lion bite to the head. The lion aspect is seen more explicitly in other postings on this blog and this motif is related to two important 'Old World' palaeoart memes as described by Dr. James Harrod at originsnet.org.
The Miles Point, Maryland, anvil stone may have been an object imbued with symbolism which was important to its makers. The combined happy and frowning face masks have also been seen here in two sculptures from the Arkfeld Site in Clear Brook, Virginia.