Manu91 Posted Tuesday at 05:54 PM Share Posted Tuesday at 05:54 PM Hello everyone. Im new on this forum ,I signed up to know the opinion of experts and all you fossil fans about this "fossil?" I found at a flea marked days ago. I leave you some photos , all your opinions are welcome thanks Link to post Share on other sites
Rockwood Posted Tuesday at 06:24 PM Share Posted Tuesday at 06:24 PM I don't think it's an egg. I doubt it's a fossil, but I don't really have a clue what it is. 1 2 Link to post Share on other sites
Randyw Posted Tuesday at 06:58 PM Share Posted Tuesday at 06:58 PM I agree it's not an egg. It reminds me of either a concretion or an infilled geode where the center has completely crystalized. In pictures 2&3 I can't tell if the flat spot is crystal or just shiney. Is it wet or is it coated with something in that area? 1 Link to post Share on other sites
Manu91 Posted Tuesday at 07:21 PM Author Share Posted Tuesday at 07:21 PM Its not wet or covered, it seem to me a shiny silicate Link to post Share on other sites
JBkansas Posted Tuesday at 09:37 PM Share Posted Tuesday at 09:37 PM There are some pretty good egg guides for the next time you think you see one: 1 Link to post Share on other sites
Styles Posted Wednesday at 01:41 AM Share Posted Wednesday at 01:41 AM Is it not chert? Link to post Share on other sites
Pliosaur Posted Wednesday at 06:08 AM Share Posted Wednesday at 06:08 AM Here's a great resource that might help in identifying common concretions that might be mistaken for fossils https://www.priweb.org/blog-post/concretions Hope it helps! 1 Link to post Share on other sites
Rockwood Posted Wednesday at 06:14 AM Share Posted Wednesday at 06:14 AM 4 hours ago, Styles said: Is it not chert? That is kind of the problem. What is a concretion with a rind doing in brecciated looking chert ? 1 Link to post Share on other sites
Manu91 Posted Wednesday at 03:09 PM Author Share Posted Wednesday at 03:09 PM I read your guides and they they convinced me even more that it is a fossil egg , there is something that cover the "oval" in the part attached to the rock wich would appear to be removed from the top. I leave you photos more accurate .... Link to post Share on other sites
Manu91 Posted Wednesday at 03:11 PM Author Share Posted Wednesday at 03:11 PM Could it be the egg shell? Link to post Share on other sites
Ludwigia Posted Wednesday at 03:15 PM Share Posted Wednesday at 03:15 PM If you still don't believe us, then take the thing to your local natural history museum for appraisal. Link to post Share on other sites
Fossildude19 Posted Wednesday at 03:52 PM Share Posted Wednesday at 03:52 PM 40 minutes ago, Manu91 said: Could it be the egg shell? I don't believe so. Link to post Share on other sites
Phos_01 Posted Wednesday at 04:00 PM Share Posted Wednesday at 04:00 PM I don't think its a Dinosaur egg im sorry. I believe its a rock.. In fact I think its a fabrication, of two rocks placed together, I think the round rock is placed inside this rock with matrix , look at the round carved corner against the matrix that looks very weird. There is no egg shell I can see from these photos . The round rock looks like a sort of granit. Link to post Share on other sites
JohnJ Posted Wednesday at 04:08 PM Share Posted Wednesday at 04:08 PM @Manu91 Do an online image search for "concretions". It is common for them to have exfoliating layers. 1 2 Link to post Share on other sites
Rockwood Posted Wednesday at 06:56 PM Share Posted Wednesday at 06:56 PM 3 hours ago, Manu91 said: I read your guides and they they convinced me even more that it is a fossil egg , Now the task would be to explain in more detail what indicates this to be an egg. Egg shell must be porous enough to allow passage of gasses to and from the embryo. The shell must be thin enough for the young creature to breach. I'm having trouble seeing this here. 2 Link to post Share on other sites
Auspex Posted Wednesday at 07:56 PM Share Posted Wednesday at 07:56 PM I believe it is a concretion. It looks a bit asymmetrical, and the matrix seems very unusual, too, unlike any sedimentary structure I am familiar with. Going through the process of metamorphosis from a sedimentary state would have destroyed any fossils therein contained. 2 Link to post Share on other sites
Manu91 Posted Wednesday at 10:10 PM Author Share Posted Wednesday at 10:10 PM Yes, you were right. It's not a fossil egg. I found images very similar to my stone, they are called "chert nodules",at this point I think it is one of these or at least something similar and certainly not a fossil. Thank you all for your opinions. 3 Link to post Share on other sites
FossilNerd Posted Friday at 11:28 AM Share Posted Friday at 11:28 AM On 1/25/2023 at 5:10 PM, Manu91 said: Yes, you were right. It's not a fossil egg. I found images very similar to my stone, they are called "chert nodules",at this point I think it is one of these or at least something similar and certainly not a fossil. Thank you all for your opinions. My hat off to you for taking the advice given here to heart during the examination of your specimen. Many people come to TFF seeking our opinions for items such as yours, but ignore the combined years of wisdom found here. They usually seem to have their mind made up before even creating an account to post their specimen. Your reaction to the given advice is a breath of fresh air. Thank you! 1 6 Link to post Share on other sites
westcoast Posted Friday at 11:58 AM Share Posted Friday at 11:58 AM This looks like a septum of an orthoconic nautilod with a siphuncular hole in the centre. Maybe? Link to post Share on other sites
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