Hello was in Potomac river area hiking saw this rock, about 5 feet or more.
On one side it had shape which looked like due to fossilized remains or head or pelvis of a animal or just water carved it?
Video and full size pictures here https://drive.google.com/folderview?id=18z9JWGLYdPZBwCrd3VbRlqZ44GjANR1k