The "Other Hard Place"; Two Pyramid Hammerstones

[meetmaker]

An anvil needs a hammer. Hammerstones are an important facet of a toolworking assemblage. The two I have pictured are interesting in that they are not the typical ovoid stone. Found in Mahoning County, Ohio in 2011 associated with anvil stones. The hammerstone on the right was found in the same hole as anvil #3 when it was pried from the forest floor.
Unassuming, they both have had their surfaces ground and the materials have an intrinsic beauty. Most of all it is the supreme ergonomic design as tools that is remarkable.
Essentially a pyramid shaped stone where four irregular triangle tips meet to form the striking point. Both tools are shaped and weighted so that when the wrist is flicked the striking point follows the arc of motion to deliver energy efficiently and precisely.
The stone on the left has its base cupped for comfort in the palm. The dark stone on the right has a second striking point.
Because of associated artifacts I believe these were direct percussion hammerstones used for the making of expedient tools of coarse stone.