HISTORIC AMERICAN BULL BISON SKULL CAP. This gorgeous bison skull cap has a beautiful natural patina. Found on a river bank in THE UPPER MIDWEST.This bison likely died 100's to 1000's of years ago and has a horn core spread of 22. This skull cap has been preserved with an acrylic stabilizing product. This item is in the category "Collectibles\Rocks, Fossils & Minerals\Fossils\Vertebrates\Mammals". The seller is "jode_15577" and is located in this country: US. This item can be shipped to United States.