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Post by johnw on Jul 31, 2018 11:11:07 GMT -5
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Deleted
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Post by Deleted on Jul 31, 2018 11:31:47 GMT -5
My first impression is that it is a botryoidal agate formation with layers of opalite that only look like egg shell. Have you examined the "shell" under a microscope? Dino shell is porous (even if agatized, you'll see agate-filled pores), and the pieces I have and have seen were preserved in limestone type (petrified by calcite, apatite, siderite, etc.) formations rather than in agate flows.
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Post by Deleted on Jul 31, 2018 16:37:01 GMT -5
Since I found a piece of dino egg coinciding with the new image Upload button Tommy has added (  ), I thought you might want to see how magnified agate-filled pores look in a fossil dino egg shell (note the larger pores top out at about 0.5 mm in this image): Also, from the side of the thin shell, you should be able to see that the pores go all the way through from the surface to the interior. The pores are what allowed oxygen to reach the embryo during development: Structure is similar for all dino eggs, though size and thickness varies between species. This particular piece is Saltasaurus (Titanosauridæ family, lower Allen formation, Río Negro Province, Patagonia, Argentina) from the Cretaceous. |
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Post by johnw on Jul 31, 2018 21:26:54 GMT -5
My first impression is that it is a botryoidal agate formation with layers of opalite that only look like egg shell. Have you examined the "shell" under a microscope? Dino shell is porous (even if agatized, you'll see agate-filled pores), and the pieces I have and have seen were preserved in limestone type (petrified by calcite, apatite, siderite, etc.) formations rather than in agate flows. Hello rocks2dust, thank you for you clarification. I have not looked through a microscope at the "shells" yet, need a microscope. Can you shed any light on the "spud" like protrusion on the left side of the piece? I appreciate all the information you can give me on this. Thanks Cheers, johnw |
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Post by johnw on Jul 31, 2018 21:30:15 GMT -5
Since I found a piece of dino egg coinciding with the new image Upload button Tommy has added (  ), I thought you might want to see how magnified agate-filled pores look in a fossil dino egg shell (note the larger pores top out at about 0.5 mm in this image): Also, from the side of the thin shell, you should be able to see that the pores go all the way through from the surface to the interior. The pores are what allowed oxygen to reach the embryo during development: Structure is similar for all dino eggs, though size and thickness varies between species. This particular piece is Saltasaurus (Titanosauridæ family, lower Allen formation, Río Negro Province, Patagonia, Argentina) from the Cretaceous. Hello again, thank you for showing this fine image. I appreciate seeing this and understanding about the Dino eggshell. Really fascinating. Cheers, johnw |
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), I thought you might want to see how magnified agate-filled pores look in a fossil dino egg shell (note the larger pores top out at about 0.5 mm in this image):
), I thought you might want to see how magnified agate-filled pores look in a fossil dino egg shell (note the larger pores top out at about 0.5 mm in this image):
