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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.

post-20385-0-02495500-1453254566_thumb.jpg

Edited by Pterodactyl
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Can you see suture lines separating the chambers? Are they simple, sinuous lines (nautiloid) or complex, intricate patterns (ammonite)?

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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!

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Nautilus...see the placement of the siphuncle.

Edited by PFOOLEY
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This is a way I always remember.

post-14584-0-70940000-1453256263_thumb.jpg

post-14584-0-87075600-1453256271.jpg

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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.

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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. :)

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Need better photos to say, but here you have other images of the diferent suture lines.

1-ammonoids

2-nautiloids (first one)

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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.

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