PLEASE! Take that to a knowledgeable person at a university anthropology department or museum. That may well be thousands of years old and represent important information about a native culture. Don't make it into yet another unintelligible souvenir in a box or on a wall. The context is already lost by disturbing it, but some information may still be gleaned by showing someone who knows how to interpret the surrounding matrix if you show them the place you found it. That area is kind of the "cradle" of the entire civilized world. We may all learn something from that if it is not hauled away to obscurity.
Sometimes the best finds are information!