fifbrindacier Posted January 26, 2017 Share Posted January 26, 2017 This ammonite is about 8 cm, it is from the Turonian - Senonian (-91 to -83 my) of Touraine, France. The ammonites listed in the official geological documents are : Barroisiceras haberfellneri, Romaniceras deveriai and Sphenodiscus requienus. I think this one is a Sphenodiscus but i am not expert enough, so i ask your opinion. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 26, 2017 Author Share Posted January 26, 2017 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 26, 2017 Author Share Posted January 26, 2017 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted January 26, 2017 Share Posted January 26, 2017 Hello from Texas. Sphenodiscus lacks ribs. Some specimens have weak flank nodes. The venter sharpness varies a bit between species, but tends to be rather sharp on the Texas specimens I've found, esp in the juvenile whorls. Sutures are extremely complex and distinctive in Sphenodiscus as well. Sorry I can't offer a positive ID, just a positive non-ID. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 26, 2017 Author Share Posted January 26, 2017 1 hour ago, Uncle Siphuncle said: Hello from Texas. Sphenodiscus lacks ribs. Some specimens have weak flank nodes. The venter sharpness varies a bit between species, but tends to be rather sharp on the Texas specimens I've found, esp in the juvenile whorls. Sutures are extremely complex and distinctive in Sphenodiscus as well. Sorry I can't offer a positive ID, just a positive non-ID. Thanks for having taken a look at it. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted January 26, 2017 Share Posted January 26, 2017 A few pics of a Texas Maastrichtian Sphenodiscus, I forget if this one is pleurisepta or intermedius. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Max-fossils Posted January 26, 2017 Share Posted January 26, 2017 6 hours ago, fifbrindacier said: but i am not expert enough Yeah right. You're a lot better with ammonites than many people on this forum, namely me. But by doing a quick google search, I agree that Sphenodiscus does not match your ammonite. From the three options you gave, I think yours is a very worn Romaniceras deveriai. Yet I'm even less of an expert than you, in fact I'm not even an amateur (I'm no more than beginner, where you complete the stage: make a quick Google search ). So I suggest you wait till someone like @Ludwigia comes in (as far as I know, he's the one with the most ammonite knowledge on this forum). Congrats on the find by the way, because in either case it's really nice! Best regards Max 1 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Ludwigia Posted January 26, 2017 Share Posted January 26, 2017 Sorry, but this time I'm out of my depth, since I'm not at all familiar with the fauna of this age. I did check out the species mentioned, but to my eyes none of them appear to quite fit. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
FossilDAWG Posted January 26, 2017 Share Posted January 26, 2017 None of the listed ammonite genera fit, at least according to my knowledge of them. Sphenodiscus in particular is way out, for the reasons given already plus Sphenodiscus is highly involute, and your specimen is very evolute. Did you collect this yourself, or did you purchase/trade for it? In other words, how confident are you of the age/locality information? Don 1 Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 27, 2017 Author Share Posted January 27, 2017 3 hours ago, FossilDAWG said: None of the listed ammonite genera fit, at least according to my knowledge of them. Sphenodiscus in particular is way out, for the reasons given already plus Sphenodiscus is highly involute, and your specimen is very evolute. Did you collect this yourself, or did you purchase/trade for it? In other words, how confident are you of the age/locality information? Don I collected it with a member of my family and then i looked at the geologic map and the file that goes with it. They mentionned only those species that are quite rare in this area, so, if it is another species it must be uncommon where we found it. I'll try to look on Hervé's site (http://www.ammonites.fr) "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 27, 2017 Author Share Posted January 27, 2017 I looked on that site and found out two other species you can find in the same department : Protexanites Bourgeoisianus and Peroniceras westphalicum. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 29, 2017 Author Share Posted January 29, 2017 I have wet it to try to show more details "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 29, 2017 Author Share Posted January 29, 2017 Hi, i looked on @herve's site, i found something looking-like to my untrained eyes that is Kamerunoceras, but, of course, that is only a supposition. Mine is evolute platicone has crossing ribs and has bullae that spread in more than two ribs. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted January 30, 2017 Share Posted January 30, 2017 I've only hunted France once, so I'm by no means an expert, but have you considered Jurassic genera like Ataxioceras and Orthosphinctes? I'm focusing on the bifurcated ribs on the flanks, and keeless venter. I may be way off base...just throwing it out there. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 30, 2017 Author Share Posted January 30, 2017 12 hours ago, Uncle Siphuncle said: I've only hunted France once, so I'm by no means an expert, but have you considered Jurassic genera like Ataxioceras and Orthosphinctes? I'm focusing on the bifurcated ribs on the flanks, and keeless venter. I may be way off base...just throwing it out there. I found out the name of another ammonite of this place and of the Turonian : Collignoceras papale, but of what i see, the adults specimen are different from mine. I know the juveniles ones are a little different from the adults, but i didn't found a photo of one. I must agree mine more looks like a Jurassic ammonite, like the ones you mentionned. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted January 30, 2017 Author Share Posted January 30, 2017 I looked at the Jurassic ammonites and saw it looked very much like a procerites. It must come from a micro outcrop. "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted February 1, 2017 Author Share Posted February 1, 2017 After asking questions to forumers on a french forum, someone told me it could be a kind of Choffatia, a perisphinctidae from the Callovian. And thanks to all of you for your answers. 1 "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
fifbrindacier Posted February 1, 2017 Author Share Posted February 1, 2017 On 26/01/2017 at 9:55 PM, Max-fossils said: Yeah right. You're a lot better with ammonites than many people on this forum, namely me. But by doing a quick google search, I agree that Sphenodiscus does not match your ammonite. From the three options you gave, I think yours is a very worn Romaniceras deveriai. Yet I'm even less of an expert than you, in fact I'm not even an amateur (I'm no more than beginner, where you complete the stage: make a quick Google search ). So I suggest you wait till someone like @Ludwigia comes in (as far as I know, he's the one with the most ammonite knowledge on this forum). Congrats on the find by the way, because in either case it's really nice! Best regards Max Ma tourangelle a plus d'un Tours dans son sac. It means : My ammonite from Touraine has more than one trick up in her sleeve (The town of Tours is the capital of Touraine and trick means tour) "On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry) "We only well see with the heart, the essential is invisible for the eyes." In memory of Doren Link to comment Share on other sites More sharing options...
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