Pterodactyl Posted January 20, 2016 Share Posted January 20, 2016 (edited) I bought this fossil at the Nature's Gallery in Carrollton. Not sure if it's an ammonite or a nautilus. Also can somebody tell me the difference between the two and how to distinguish them? sorry for bad quality. Edited January 20, 2016 by Pterodactyl "Welcome...To Jurassic Park!" -Richard Attenborough Link to comment Share on other sites More sharing options...
Pterodactyl Posted January 20, 2016 Author Share Posted January 20, 2016 Another pic: "Welcome...To Jurassic Park!" -Richard Attenborough Link to comment Share on other sites More sharing options...
JohnJ Posted January 20, 2016 Share Posted January 20, 2016 Can you see suture lines separating the chambers? Are they simple, sinuous lines (nautiloid) or complex, intricate patterns (ammonite)? 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Pterodactyl Posted January 20, 2016 Author Share Posted January 20, 2016 And one more: "Welcome...To Jurassic Park!" -Richard Attenborough Link to comment Share on other sites More sharing options...
lcordova Posted January 20, 2016 Share Posted January 20, 2016 Seems an Ammo, but here you will find people that actually know, not an amateur like me.. Link to comment Share on other sites More sharing options...
Pterodactyl Posted January 20, 2016 Author Share Posted January 20, 2016 Can you see suture lines separating the chambers? Are they simple, sinuous lines (nautiloid) or complex, intricate patterns (ammonite)? They are pretty complex so it is probably an ammonite. Thank you so much. You were a big help! "Welcome...To Jurassic Park!" -Richard Attenborough Link to comment Share on other sites More sharing options...
PFOOLEY Posted January 20, 2016 Share Posted January 20, 2016 (edited) Nautilus...see the placement of the siphuncle. Edited January 20, 2016 by PFOOLEY "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
icycatelf Posted January 20, 2016 Share Posted January 20, 2016 Here's a nifty little chart that I found when I was trying to figure out what my ammonoid was:http://www.fossiel.net/system/images/artikelen/Ceph_Sutures1.pngYour photo is poor quality (try taking it in natural light instead), but it looks ammonitic (ammonite) to me. 1 Casual surface-collector and Pokémon fan. Link to comment Share on other sites More sharing options...
fossilized6s Posted January 20, 2016 Share Posted January 20, 2016 This is a way I always remember. 1 ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
BobWill Posted January 20, 2016 Share Posted January 20, 2016 That looks like the siphuncle showing in a couple of places along the venter. That would make it an ammonoid. If the sutures are compex than it's an ammonite. It looks like it has been polished so it may be from Morocco since so many from there are. A close-up and focused view of the sutures will tell someone who knows that material what it is. 1 Link to comment Share on other sites More sharing options...
PFOOLEY Posted January 20, 2016 Share Posted January 20, 2016 Nautilus...see the placement of the siphuncle. Nevermind, That looks like the siphuncle showing in a couple of places along the venter. That would make it an ammonoid. I see it now. "I am glad I shall never be young without wild country to be young in. Of what avail are forty freedoms without a blank spot on the map?" ~Aldo Leopold (1887-1948) New Mexico Museum of Natural History Bulletins Link to comment Share on other sites More sharing options...
Herb Posted January 20, 2016 Share Posted January 20, 2016 I vote for ammonites also "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Coelacanth Posted January 20, 2016 Share Posted January 20, 2016 Appears to be an ammonoid. Link to comment Share on other sites More sharing options...
Guguita2104 Posted January 20, 2016 Share Posted January 20, 2016 Need better photos to say, but here you have other images of the diferent suture lines. 1-ammonoids 2-nautiloids (first one) Link to comment Share on other sites More sharing options...
Ludwigia Posted January 20, 2016 Share Posted January 20, 2016 I agree with Bob Will. The siphuncle in post #4 was the first thing I noticed, so there's no question to me at all that it's an ammonite. The siphuncle on a nautilus is always in the middle and can only be seen in cross section. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Guguita2104 Posted January 21, 2016 Share Posted January 21, 2016 Need better photos to say, but here you have other images of the diferent suture lines. 1-ammonoids image.jpeg 2-nautiloids (first one) image.png Sorry, I tried to attach pictures from the phone. Here they are: 1- 2- Link to comment Share on other sites More sharing options...
ammofan Posted January 21, 2016 Share Posted January 21, 2016 100% an ammonite, you can see by its shape, looks like a polished cleoniceras ammonite from madagascar, defo not a nautilus. Link to comment Share on other sites More sharing options...
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