This is the stone head of a hammer that was used by Plains Indian groups for processing bison carcasses. Its called a grooved maul because of the pecked channel that was tapped out around its middle. Its made on a glacially rounded and deposited quartzite cobble and you can see how one end has been flattened through use. A maul like this would have been hafted to a handle made from a bent sapling that was wrapped through the notch and tied in place. This one was found northwest of Vulcan, Alberta and would have been used to break open bones to extract marrow or pound dried meat to make pemmican.