IT IS A HORSE TOOTH, probably the fossil zebra Equus scotti. Horse teeth from the skull are long and square like these. The chewing surface often has a "bow-tie" shape in the enamel folds. The root ends are usually hollow as these are. Horses are often found with mammoth remains, especially in central Texas.

Thanks to the young lady who made us aware of these.

Joe Taylor
Director/Curator
Mt. Blanco Fossil Museum