Severn Possible Bone

[Andúril Flame of the West]

Recently I took a trip to a new spot in the Maastrichtian of Maryland. I did not manage to recover too much vertebrate material, though I have been quite intrigued by one piece that I collected. The main question regarding this piece is whether it is bone or whether it is simply a suggestively shaped rock. If it does turn out to be bone, would it be possible to determine what it may have come from? The main marine reptiles that are recovered from these deposits are mosasaur and marine turtle. 

 

A few photographs of the specimen in question. If better photographs are needed/photographs from a different angle, I would be more than happy to attach some to this thread. 

 

 

 

 

 

 

 

 

Thanks in advance for all suggestions and opinions! 

[Thomas.Dodson]

I'm leaning towards rock but post another picture of the cross section just in case. I think it is just sedimentary structure in the cross section but a clear photo should make it more apparent.