Treasure1869,
There is a specific Spanish name for that device and it escapes me now. It is the pestle part of a mortar and pestle used for grinding corn meal. They were first used by the mesoamerican indians, but quickly also became used by the early Spanish settlers to the Americas. To pin it down specifically, it would help to know the context of the find. In other words did you find around an old Spanish settlement or around an old Indian community, ect.?