Check the listing for details. Large Bison Antiquus 1/4 Skull! 32". Condition: Used. Listed at 45.00 USD. This partial horn core and skull fragment is from a bison antiquus that I personally found in iowa. This sale includes the horn core and the Bison tooth. The core itself measures 10 in so if you double that to 20" and add 12" for the width of the skull you can approximate that the skull was 32" across. Very few of these large skulls survive because of the torque that is put upon them when they are eroded into the river. The fossil has been stabilized with professional grade Paraloid B72.