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ferns and urchin


fifbrindacier

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fifbrindacier

Hi everybody, i recently made an exchange and so i received those ferns, all i know is that they come from Colorado, i have no other clue about them.

I also received an unknown urchin and have no clue about it.

Could you help me know a bit more about them ?

 

The longest diagonal of that piece is a little less than 15 cm, the base is about 13 cm and it is about 11 cm hight. @Plantguy @paleoflor ?

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And your fern looks to be from St. Clair, Pennsylvania.

 

Did you not get any information from your trade partner?

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fifbrindacier
4 hours ago, caterpillar said:

Your echinid comes from Morocco. Maybe Stomechinus

Thank you very much Caterpillar :dinothumb:

I have a Rhabdocidaris from Garsif which fossilization look like this one's (although it is slightly less black), so i guess it has great chances to be also from Garsif.

4 hours ago, caldigger said:

And your fern looks to be from St. Clair, Pennsylvania.

 

Did you not get any information from your trade partner?

 

1 hour ago, abyssunder said:

Your plant material looks close to Alethopteris, to me, don't know which species.

I remembered Plantguy had shown a fern with the same kind of fossilization, so i looked his album and found his sample is an Alethopteris from the Llewellyn formation of Saint Clair and it is an Alethopteris serlii.

Can this kind of fossilization be found in the Pennsylvanian of Colorado, or did the precedent owner had a wrong information ? I wonder, but i agree at 100 °/° that my sample looks very much like his.

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I am not aware of any Colorado sites that produce Upper Carboniferous (i.e. Pennsylvanian) plants with this sort of preservation.  Indeed, plants of that age are very scarce in Colorado.  I would say I'm 99.9% sure it is from St. Clair.

 

Don

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28 minutes ago, fifbrindacier said:

I remembered Plantguy had shown a fern with the same kind of fossilization, so i looked his album and found his sample is an Alethopteris from the Llewellyn formation of Saint Clair and it is an Alethopteris serlii.

Can this kind of fossilization be found in the Pennsylvanian of Colorado, or did the precedent owner had a wrong information ? I wonder, but i agree at 100 °/° that my sample looks very much like his.

My first thought was A. serli, but I'm not versed in fossil plant material, that's the reason why I said only the genus. :)

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fifbrindacier
17 minutes ago, FossilDAWG said:

Oh, and what an interesting urchin! :wub:

 

Don

This is the Reason why i wanted to participate to that exchange in the first place, i didn't know he would also send me those beautiful white ferns :wub:. You know, when i saw plantguy's ones i thought it would be some kind of dream to have some like those, but i'm a bit too far from Pennsylvania :P. And there my wish is granted whithout any forewarning and whithout being waited.:yay-smiley-1::raindance::megdance:

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Nice plant specimen and urchin! Yep that darker gray matrix with the white fern mineralization (pyrophyllite replacement) suggests St.Clair, PA  material and I agree is pretty special. Yep, I believe that's A.serli--it takes some crazy forms in some of the specimens I've seen. Not sure if there are any other Alethopteris species from that locale but maybe the locals in the Pennsylvania area might know.  

 

Great additions! congrats. 

Regards, Chris 

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fifbrindacier

Thank you very much Chris, that was really a magnifical surprise for me.

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