Dennis Boggs find, Irrigon, Oregon. I think this could be an abstract standing pregnant female in right profile form being depicted by selected removal of a stone layer, leaving a bulging rounded shape on the lower right side here.
RIGHT: side 2 of Irrigon, Oregon sculpted stone. (click photos to expand)
The geometric shaping of this Oregon stone was probably inspired by the raw material, white quartz with alternating tan layers
Side view of the sculpted stone
A Knox County, Ohio, flint from my collection, ca. 8,000 to 3,000 BP
The Ohio flint on top of the Oregon quartz sculpture for size and shape comparison
(Left) Oregon sculpture, (center) Acheulean handaxe, Morocco, N. Africa, (right) Ohio