I wirebrushed the pc that looks like a duck head and found it had an attachment point. I put two together and they fit perfectly, except one little chip. These sand colored rocks are made of diabase. This material was used to build statues and monuments, stonehenge, and headstones. It was also used in the Tools that built stone henge and a lot of egypts history. These seem to have broken during the final firing to temper the stone before final sharpening. They ding like a bell when tapped. Each one has a flaw with a light coating of sand covering that area of break. They must of fired them many times. I have no way of knowing the age except by finding the age of the bones that are at the same level as the bottom of finned dinos head. There are angled, tapered, areas possibly used to hold the tools for working on them. They could have carved this and fired it as they did the tools. This stone has tipped over and the bones come from under it I think. Maybe a bear got squashed. How long before that these were made, I do not know. There was about 20" of soil and clay on top of the bones and to the bottom of finned dino.