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ThePrehistoricMaster

Four Ammonites Need ID

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ThePrehistoricMaster

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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ThePrehistoricMaster

1.

20180731_171343.jpg

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ThePrehistoricMaster

2.

20180731_171404.jpg

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ThePrehistoricMaster

3.

20180731_170731.jpg

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ThePrehistoricMaster

4.

20180731_170810.jpg

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The Amateur Paleontologist

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!

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Tidgy's Dad

One and two look like Perisphinctes from Madagascar. 

3 and 4 I don't know. 

 

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-AnThOnY-

4 looks to be Sphenodiscus, from the Pierre Shale

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The Amateur Paleontologist

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

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ThePrehistoricMaster
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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Ludwigia

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.

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