Bison antiquus Skull BC-313
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Age: 12,000 years (late Pleistocene). Discovered at Ayer Pond, Orcas Island, in the Pacific Northwest in 2003. The skull of this specimen is considered to be one of the finest and largest found to date. With a horn spread of 31 inches, Bone Clones captured all the incredible detail of the original, including the intact nasals. Significantly, the bones suggest human activity in this region about 800 years before the Clovis era. The evidence supplied by the bones is consistent with butchering by humans and inconsistent with carnivore activity (e.g., wolves would have typically damaged the nasals, bears would not typically have broken the humerus at its thickest point, and there would have been far more surface damage to the bones). View Individual Bones Below.

Bison antiquus Skull and Stand BC-313-ST
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The right distal tibia displays two deep V-section chopmarks, suggesting blows from a heavy object. It has been suggested that the bison was butchered by humans, with the more desirable, meaty portions taken elsewhere and the unwanted sections of the carcass left on top of a frozen pond, eventually settling to the bottom where they were preserved and kept out of harm's way until their discovery by workers who were digging a pond.

For more information:
Kenady, S., Wilson, M., Schalk, R., & Mierendorf, R. (2010). Late Pleistocene butchered Bison antiquus from Ayer Pond, Orcas Island, Pacific Northwest: Age confirmation and taphonomy. Quaternary International, pp. 1-12.
Coffey, R. (March 4, 2011). Bison versus mammoths: New culprit in the disappearance of North America's giants. Scientific American. Online.