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Probable geologic from chalk formation


Chamfer

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This little specimen is just 5 mm tall, and 8 mm at its widest.

This comes from a chunk of matrix that I picked up in the chalk deposits in the area of Demopolis, Alabama. Having found an enchodus fish tooth in similar material, I'm making an effort to break up and look through this stuff a bit better before throwing it away.

This particular tiny thing was left behind in after leaving some pieces overnight in a white vinegar bath. The chalk dissolved away, leaving this.

Note the fibers scattered around it - those have come from the specimen.

 

I'm 90% sure this is simply geologic, not fossil. Even so, I'm curious if anyone can point me to how this might have formed.

 

unknown_8369.jpg

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Looks like gypsum to me and would explain why it didn't dissolve in the vinegar solution. Gypsum is a hydrous calcium sulfate and does not react with vinegar.

...I'm back.

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Hi,

 

That also seems to me to be some gypsum.

 

Coco

----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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