Wow dredging my front yard to make a tiny pond I came across hundreds if not thousands of what apparently via Google are identified as Paleolithic tools and rock art. This is just one of 1000s. This one specifically has indentions of many symbols that are also found on many of the other specimens of artifacts found very well preserved giving the estimated age of item.

2inches by 3 inches or so bout inch thick on one side maybe half inch thick at other end.