I'm with you digger. That first piece is the same type chopper that I posted. The first pic in this thread. Only difference is yours is prettier and I think a bit smaller than mine.
Everyone in this thread except for Unlclemac is all confused. He asked about an artifact that is referred to as a "cobble chopper" which is different from a regular or larger chopper...that you guys seem to want to talk about for some reason. COBBLE CHOPPERS are made on cobble!! Cobble is a pebble!!! Have fun UNC.