Dinosaur Egg Shell

[DINOMAN91]

These egg shells were found at a site in Montana with some troodon teeth are these possibly troodon egg shells? There around 1mm thick with a smooth surface 

[Rockwood]

I must be done. 

@Troodon

[DINOMAN91]

??

[Rockwood]

Just now, DINOMAN91 said:

??

He's the man to ask.

[DINOMAN91]

I’m hoping he responds to this post with his knowledge 

[jpc]

When I worked at Egg Mountain, we said the troodon eggshell bits were the highly textured ones.  This is lacking that texture, but I think the ID on Two Medicine eggshells has shifted.  

[Troodon]

Do you have a locality where this was found?

[DINOMAN91]

Two medicine formation on private land along with some troodon teeth and bones as well as not far from that site they found Unidentified raptor eggs I can post some of those as well maybe you can give your opinion of a species Possibly

[DINOMAN91]

Here some photos of the other egg shells found near the same site labeled as raptor  egg shells 

[Troodon]

Do you know the county where they were found. These look like Two Medicine.

[DINOMAN91]

Okay sorry had to get into contact with him both sets off egg shells were found close to the same area in the two medicine formation along with troodon teeth and Bambi raptor bones

[DINOMAN91]

And I’m working on the exact county troodon I think he’s crashed out for the night so I will get you that information tomorrow 

[DINOMAN91]

East of browning montana If that helps 

 

[Troodon]

The area around Browing is Two Medicine FM.  JRF is more north centrally located.

[Troodon]

This was provided by @CBchiefski dont recall its orgin but its TMF.

[DINOMAN91]

Thank you troodon for all your information and thank you to everyone else for your comments 

[CBchiefski]

Howdy @DINOMAN91 , and thanks for your patience as I have been quite busy this spring. From what you are describing as the location along with their level of preservation, they are likely from Two Medicine Formation and I will give my opinions based on that assumption. The smooth eggshell is likely Prismatoolithus, which is the eggshell type associated with Troodon. The bumpy eggshell is most likely Continuoolithus, which was originally thought to be the eggs of Troodon like @jpc said. Sadly the only embryonic remains associated with Continuoolithus are not diagnostic but we can be fairly confident the eggs are from a smaller non-avian theropod dinosaur. The remaining fragments all appear to have the same surface ornamentation, could you provide a cross-section picture, like the 2^nd pic of the smooth eggshell? They have varying levels of erosion plus sediments covering the shell and so I suspect Spheroolithus but would like a side picture to be more certain. There are other eggshell types which they could be.

Edited May 27, 2020 by CBchiefski
typo