North Carolina Cretaceous or Pliocene Reptile or Cetacean Bones?

[fossil_lover_2277]

So, I found these 5 bones, and firstly, I need to know if they are cetacean or not. If not cetacean, then they are likely crocodilian, mosasaur, or I guess possibly turtle. They come from North Carolina, either from marine Cretaceous Black Creek group deposits, or there is a chance they could be marine Pliocene (hence why I would like to either confirm or rule out cetacean if possible). The area they come from is mostly Cretaceous, but I have found a few Pliocene shark teeth there, and stratigraphic maps show nearby Pliocene stratum, so I’m not totally sure (the area is in Cretaceous stratum on the map, but Pliocene is close by). These bones have distinct shapes so I think they may be IDable...but on my own I’m lost. Thank you for any help you can provide!!!!!

 

Bone 1 (pretty sure it’s a rib):

 

 

Bone 2:

 

Bone 3: 

 

Bone 4 (I think this one is a rib too):

 

Bone 5:

 

Edited November 22, 2021 by fossil_lover_2277

[fossil_lover_2277]

I think this is a tough question, don’t know of too many places cetaceans might mix with ancient marine reptiles either...you all have helped me before with similar IDs, any thoughts?@pachy-pleuro-whatnot-odon  @JohnJ @Boesse

Edited November 22, 2021 by fossil_lover_2277

[Boesse]

Too incomplete to identify past fragments of baleen whale bone that could be either bits of mandible, rib, humerus, radius, ulna, and a couple possible others

[fossil_lover_2277]

2 hours ago, Boesse said:

Too incomplete to identify past fragments of baleen whale bone that could be either bits of mandible, rib, humerus, radius, ulna, and a couple possible others

Thanks! So what gave them away as being whale? Just curious as to differences between cetacean vs reptile bone. Is part of the difference the amount of cancellous bone present?

Edited November 23, 2021 by fossil_lover_2277

[Boesse]

Whale bone is considerably porous, but lots of mammals are - in this case it's the size and length of the bony pores that indicate it's from a large marine mammal.

[fossil_lover_2277]

40 minutes ago, Boesse said:

Whale bone is considerably porous, but lots of mammals are - in this case it's the size and length of the bony pores that indicate it's from a large marine mammal.

I see, thank you so much for the help, learned something new!