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Four Ammonites Need ID


ThePrehistoricMaster

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I have four ammonites that I cannot identify, and I hope you guys can help :)

I got no information on their age or where they were found.

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The 1st one is a perisphinctid (probably Perisphinctes sp.); I'm thinking from the Late Jurassic of Madagascar.

4th one reminds me of those late Cretaceous Pierre Shale scaphitid ammonites.

Hope that helps!

Opalised fossils are the best: a wonderful mix between paleontology and mineralogy!

 

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One and two look like Perisphinctes from Madagascar. 

3 and 4 I don't know. 

 

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@-AnThOnY- yeah - it's most likely Sphenodiscus... guess I was right on stratigraphy/location but not taxonomy, huh?

Opalised fossils are the best: a wonderful mix between paleontology and mineralogy!

 

Q. Where do dinosaurs study?

A. At Khaan Academy!...

 

My ResearchGate profile

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5 hours ago, The Amateur Paleontologist said:

The 1st one is a perisphinctid (probably Perisphinctes sp.); I'm thinking from the Late Jurassic of Madagascar.

4th one reminds me of those late Cretaceous Pierre Shale scaphitid ammonites.

Hope that helps!

 

4 hours ago, Tidgy's Dad said:

One and two look like Perisphinctes from Madagascar. 

3 and 4 I don't know. 

 

 

4 hours ago, -AnThOnY- said:

4 looks to be Sphenodiscus, from the Pierre Shale

 

Thank you for the help!

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I'd say that the first 2 are Perisphinctidae from Madagascar and the last one could be Coilopoceras springeri  from the New Mexican Late Cretaceous. Can't determine the 3rd one without views of venter and mouth aperture.

 

Greetings from the Lake of Constance. Roger

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