Giant Bison of the type McJunkin discovered had gone extinct at the end of the last Ice Age ; proof of a human kill established the antiquity of North America 's native cultures .
Recognizing the significance of the find , McJunkin left the site undisturbed and alerted archaeologists .
Giant Bison of the type McJunkin discovered had gone extinct at the end of the last Ice Age ; proof of a human kill established the antiquity of North America 's native cultures .
Recognizing the significance of the find , McJunkin left the site undisturbed and alerted archaeologists .