It is not uncommon to find bones in a cave. I recall one dig where we were using suction nozzles to remove glacial silt from a deep sinkhole near Shelburne. It is an area known as "The roof of Ontario", for its height and initial appearance above a receeding glacial lake. Though it is not well known to the general population, there are many impressive sinkholes around there. In the hole in which were were digging our work unearthed several lumps of what initially appeared to be wood but the more knowledgeable amongst us recognized them as bones. Later identification by our contact at the Royal Ontario Museum revealed that some of those bones once belonged to ice age caribou.
The bone in this picture was found wedged in the roof of the ice cave at the Hell Holes. Ron said that in that area his cows once roamed free and the odd one had disappeared.
This picture was taken facing up toward the roof of the tunnel. The dead animal must have fallen from above and somehow worked its way down through the rock until it was hanging upside down through a hole above where I now lay. Porcupine scat appears to have covered the animal over from the upper tunnel and I surmised that the remainder of the skeleton was probably buried beneath me.
I suspect that this is a pelvis and at the top right of the bone is a socket into which once fit a vertebrae. I had not noticed the pelvis until I was wiggling along underneath and the single, still attached vertebrae fell onto my helmet.
On my return to the surface Greg took the fallen bone to the ROM and his contact, (Kevin) gave a professional opinion. He said that it was pretty similar to the last lumbar vertebrae of a sub adult cow. Though as he pointed out, it can be tricky to separate a cow from a bison. In his opinion, by the lightness of the bone, it was a pretty safe bet to assume that it was a cow.