Because if the atlas is the middle pic in Lemur’s horse link, I don’t think it’s a match – the holes aren’t the same, since the horse seems to have two biggish holes on either “wing,” and my bone has one.
Here’s 3 more horse atlases. Pic #1 & #3 don’t have those holes in the transverse process. Picture #2 has three holes, and our our original reference (Lemur’s) pic had 2. If you look compare #1 & #3 with the others, those two have more robust transverse processes, note the rough surfaces, that is for muscle attachment. Pic #2 and the reference pic are much more gracile and there is a bit of transparency in the bone surrounding those wholes. If you look at your pictures #1 & #2 (the bottom of the bone) you can see the indents on the bone by where the foramen on the transverse processes, the holes on the other bones are in the same location. http://www.skullsunlimited.com/graphics/lq-606-lg.jpg http://www.skullsunlimited.com/graphics/lq-607-lg.jpg http://www.skullsunlimited.com/graphics/lq-605-lg.jpg
It’s best to have more than one bone to compare against, as skeletons are part of a biological creature, and there is natural variations. Now that we’ve had 4 to compare, I am fairly certain it is a horse atlas.
I loved doing it, my favorite aspect of forensics was the puzzle solving. The only reason I chose archaeology over forensics was the puzzle solving, plus having a reason to play in the dirt as an adult.
I live in Philly, where large-animal vets are few and far between. I’ll see what other resources might be available locally – though I gotta say, those two pictures that I specified look a whole hell of a lot like what I’ve got, given how banged up my bone is.
Here’s the full sized pic of the one that Colibri posted.
Note how far out the transverse processes project on the bear atlas compared to twickster’s bone. The shape is different too. Also the articlucar facets (on the right hand side of the picture) don’t blend into transverse processes as they do on twickster’s.
I’d agree it looks very much like a horse atlas. It isn’t a bear atlas, which as achilles says has much longer transverse processes.
I’ve asked an achaeologist friend of mine to take a look at it. He says he has a horse skeleton to compare it with. I’ll let you know if he sends me his conclusions.