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Giant 500 mm ammonite México


Jaime

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Hi guys,

 

Could Any one help to ID this ammonite? It Is from Baja California, México. It measure 500 x 450 mm. It weights over 60 Kg.

 

I bought it, so i have no More data than the state, sorry...

 

 

Thank you!! 

 

Regards!

 

  

IMG_20210225_154257917.jpg

IMG_20210225_154320144.jpg

IMG_20210220_015657490.jpg

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Lots of big Pachydiscus catarinae are discovered there so these are Pachydiscus species. 

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Looks like a Pachydiscus. Perhaps P.catarinae from the Cretaceous Rosario Formation.

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I agree with Pachydiscus, likely P. catarinae from the Rosario Formation as has been suggested.  Nice fossil!  You are lucky to have acquired this, as exporting fossils from Mexico is now forbidden.  I assume yours is from an old collection.

 

Don

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Oxytropidoceras
4 hours ago, Ludwigia said:

Looks like a Pachydiscus. Perhaps P.catarinae from the Cretaceous Rosario Formation.

 

Descriptions of various species of Pachydiscus are in:

 

Kennedy, W.J. and Cobban, W.A., 1999. Pachydiscus (Pachydiscus) hornbyense

Jones, 1963, and P.(P.) catarinae (Anderson & Hanna, 1935)(Cretaceous, Campanian,

Ammonoidea). Pacific Realm marker fossils in the Western Interior Seaway of

North America: Bulletin de l'Institut Royal des Sciences Naturelles de Belgique,

Sciences de la Terre, 69, pp.119-127.

 

PDF file:

http://biblio.naturalsciences.be/rbins-publications/bulletin-of-the-royal-belgian-institute-of-natural-sciences-earth-sciences/69-sup-a-1999/irscnb_p4087_014db6p_69-supa_bulletin-8.pdf

 

Contents:

https://biblio.naturalsciences.be/rbins-publications/bulletin-of-the-royal-belgian-institute-of-natural-sciences-earth-sciences/bulletin-of-the-royal-belgian-institute-of-natural-sciences-earth-sciences/kennedy_pachydiscus_1999

https://biblio.naturalsciences.be/rbins-publications/bulletin-of-the-royal-belgian-institute-of-natural-sciences-earth-sciences/bulletin-of-the-royal-belgian-institute-of-natural-sciences-earth-sciences

 

Also, go see Anderson, F.M. and Hanna, G.D., 1935. Cretaceous geology of lower

California, Proceedings of the California Academy of Sciences, 4th series. (Vol. 23, No. 1).

https://www.biodiversitylibrary.org/page/3188207#page/33/mode/1up

https://www.biodiversitylibrary.org/page/3188207#page/46/mode/1up

https://www.biodiversitylibrary.org/page/3188207#page/49/mode/1up

https://www.biodiversitylibrary.org/part/21372

https://www.biodiversitylibrary.org/itemdetails/22493

 

Yours,

 

Paul H.

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  • 2 weeks later...
On 2/25/2021 at 8:45 PM, Oxytropidoceras said:

Hi Paul,

Thank you very much ! i will read all the references.

 

Awesome!

 

Best regards!

 

 

 

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On 2/25/2021 at 4:23 PM, Creek - Don said:

Lots of big Pachydiscus catarinae are discovered there so these are Pachydiscus species. 

Thank you very much!!

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On 2/25/2021 at 4:24 PM, Ludwigia said:

Looks like a Pachydiscus. Perhaps P.catarinae from the Cretaceous Rosario Formation.

Thank you!! Regards!

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Just important to note that Mexico does not permit the export of fossils from anywhere in the country.

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On 2/25/2021 at 5:32 PM, FossilDAWG said:

I agree with Pachydiscus, likely P. catarinae from the Rosario Formation as has been suggested.  Nice fossil!  You are lucky to have acquired this, as exporting fossils from Mexico is now forbidden.  I assume yours is from an old collection.

 

Don

Thanks a lot!  Regards!! 

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2 minutes ago, Boesse said:

Just important to note that Mexico does not permit the export of fossils from anywhere in the country.

Thank you! Yes Im aware, this piece is in Mexico.

 

Regards!

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Oh! Sorry, I saw your location is marked as "Texas" on your profile.

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