Here's two centrums hooked together. I was able to separate these with a bit of care. The big one on the bottom had a short, robust neural arch that was not blade-shaped in cross-section. Instead it is an oval cross-section, pretty robust.
p has 3 centrums as well as a nautilus, perched directly on the end of a centrum. Pretty cool!
Here's a centrun+neural arch that has the centrum rib attachment knobs on the side blending into the neural arch on the top. Must have come from the forward part of the rib cage.
And here is a rib with the neural arch that has no rib attachment knobs. Perhaps this came from the neck, where there are no ribs?
I still have 2 more backbones to finish preparing from this rock, and maybe more hidden inside it. Anyway, that's all there is for now.
Sincerely, Greg Carr