In the late 1950's my Dad was working for the Boy Scouts of America professionally out of Alexandria, Louisiana. One of his volunteer leaders north of Alexandria was a collector of Native American artifacts, and while looking for artifacts, stumbled upon a large lower jawbone near a sandy steep nearby hillside overlooking a river. He gave my Dad the jawbone and told where he found it. We as a family went to the site and found numerous large "sharks teeth", and petrified sea shells.
Dad later became friends with a oil drilling crew foreman, who gave Dad two what appears to be