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Two Medicine Eggshell


Dino Dad 81

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Hi all,

 

This eggshell fragment is from the Two Medicine formation in Browning, Montana. I'm trying to figure out if it's smooth enough to fall into the Troodon camp or if it's a worn down specimen that previously had ornamentation. I'm leaning towards Troodon eggshell with calcite coating.

 

1995639920_2023-01-1223_49_08.thumb.jpg.693c80ae5b5f36722a9f197ff5ec8bf1.jpg

 

1562976539_2023-01-1223_49_49.thumb.jpg.f467d86082713d5ff3e5e22de406be41.jpg

 

1491510526_2023-01-1223_50_29.thumb.jpg.f9cdecf30441c0df978683e2466bdc85.jpg

 

1084685220_2023-01-1223_50_56.thumb.jpg.7106a51680dfc416be3d48defba05002.jpg

 

706401930_2023-01-1223_51_55.thumb.jpg.1a4bfabc81c47ac3dfb8886558d5fd86.jpg

 

1899638228_2023-01-1223_52_23.thumb.jpg.c56b33d846c09573b281cc542fce60fd.jpg

 

Embryos_and_eggs_for_the_Cretaceous_theropod_dinos.thumb.jpg.f50f58c022cbd001033f6f0832bfa2cd.jpg

 

1957914878_Troodonegg.thumb.png.3f097147b6d90372d2458736e6d4095c.png

 

FlPpWY_XgAgCXrs.thumb.jpeg.8ef4a8a087dfdbf41e5914a6dd5a3a54.jpeg

 

Thanks!!

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It's a Two Medicine unidentified eggshell, not Troodon, like you said those are smooth.  More like "c" in the illustration

 

Screenshot_20230113_031451_Drive.thumb.jpg.929a8dc34c11cde65186f1175935d11c.jpg

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I have to go with caterpillar... the cross section does not show the crystals going perpendicular to the surface.  Rather the structure in there is going parallel to the surface (see your third photo). I think tis is a calcite deposit or something like that.  Not an egg piece.  Sorry.  

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Here is a TMF Hadrosaur egg.  The pores are call Prolatocanaliculate.

Screenshot_20230113_093918_Drive.jpg.452e54d662a90ddd7ca8a31ef98ecb17.jpg

Eggs and eggshell fragments from the Upper Cretaceous Two Medicine Formation of Montana
Karl F. Hirsch & Betty Quinn 2010

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I think better focused images of the edges would be informative.

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The human mind has the ability to believe anything is true.  -  JJ

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Here are some additional shots:

 

1093762735_2023-01-1315_48_20.thumb.jpg.a6b2b67bfefd4dbd7634fa15daddfda1.jpg

 

535712609_2023-01-1315_48_40.thumb.jpg.e938939118eb7fb41afbfe7b152ddb46.jpg

 

1695854359_2023-01-1315_50_02.jpg.83eaf6f2b66076b0090a408f8dcd95ee.jpg

 

821889200_2023-01-1315_51_03.jpg.2d9b56937406276658d34c2f041e3aa3.jpg

 

WIN_20230113_14_45_54_Pro.jpg.98bd842e0dc01c75cb11534922ba2fa4.jpg

 

WIN_20230113_14_45_16_Pro.jpg.197257e9694f9239e261a4858e6c644b.jpg

 

WIN_20230113_14_45_01_Pro.jpg.5f78bc464396677892a089b68a797348.jpg

 

WIN_20230113_14_44_44_Pro.jpg.34e22622e6116b1cea2ea7a0040a85fe.jpg

 

WIN_20230113_14_46_05_Pro.jpg.ee569dcbea160191cd22cdd1e79cecbc.jpg

 

 

 

I'm surprised Troodon isn't a possibility. It seems from all the pictures I'm looking at that very little of Troodon egg surface actually shows the underlying smoothness, since most is covered in calcite or other minerals. In the pic with the very smooth section, they say the smooth section only covers the bottom 1/3. And is it possible for ornamentation to get so uniformly eroded, yet the sides and underneath surface be so well-preserved?

 

Here are some closer up pics from the Troodon eggs in my original post:

 

1.jpg.8f606c35fcc827f3d7a1ee0aa9dbb29e.jpg

 

2.jpg.731b3ec475e98edabb8c671bd4650131.jpg

 

FlPpWY_XgAgCXrs.jpeg.f1fbc012681d4782554d663a1980808c.jpeg

 

76195503_Troodonegg.thumb.png.1837154663b43195381f7ef39d274c5d.png

 

 

 

 

WIN_20230113_14_44_44_Pro.jpg

WIN_20230113_14_45_01_Pro.jpg

WIN_20230113_14_45_16_Pro.jpg

WIN_20230113_14_45_54_Pro.jpg

WIN_20230113_14_46_05_Pro.jpg

Embryos_and_eggs_for_the_Cretaceous_theropod_dinos.pdf

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On my way down to see the new responses, I past the Hadrosaur cross-section and was reminded how incredibly deep the Prolatocanaliculate go. I'll be curious to see if you still think it's unidentifiable. Not challenging anything--just curious to know if this is incremental information and, if so, whether it matters.

 

WIN_20230113_14_45_16_Pro.jpg.ba9a6d834fd79171cf670a3aaf05578f.jpg.bbf37e34d4765e49ecfa14dc4c535c1d.jpg

 

Troodon

Embryos_and_eggs_for_the_Cretaceous_theropod_dinos.thumb.jpg.b942c22b34c3e8dc0585e675128b193f.jpg.f35afcd80811b01aa3f36152b7b48a69.jpg

 

Hadrosaur

Screenshot_20230113_093918_Drive.jpg.452e54d662a90ddd7ca8a31ef98ecb17.jpg.b57f0b06b1feb5f34dc8af227154a545.jpg

 

 

 

Troodon

883248467_Troodonegg.png.a4bb3e8b22f780d7d3f25d3ac4198918.thumb.png.c7c5bb647e545b590273b6519cc38788.png

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I’m still in the unidentified camp. The remains of the bumps on the shell matches troodons example c. They arent ridges like example b and too rough to be troodon….

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Right.. I shouldn't be looking at as necessarily being one or the other.  Troodon's main point was only that the grain can run parallel.

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