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Ordovician decalcified...?


mbarco

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Only for who is familiar with decalcified material.

Upper ordovician, Italy. Scale bar 5mm.
Decalcified specimen are preserved as the internal and the external mould, so the calcified part occupied the space between the two moulds.

 

On the left side: the two moulds of the first specimen

On the right side: only one mould available of another specimen (I guess conspecific), worst preservation.

 

Any idea of what could be?

EK_SPIKE.jpg

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I'm wondering if it would be helpful to know what this is.

 

EK_SPIKE.jpg.80267032ea92fd967a77affa53143407.thumb.jpg.7c588559e39e2fecd9aaff4ade62eb3b.jpg

 

 

Edited by Mark Kmiecik

 

 

Mark.

 

Fossil hunting is easy -- they don't run away when you shoot at them!

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I don't think so. It's a picture of an hash plate.

On the right a crinoid facet, on the left a ramose bryozoan.

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These look similar to the internal moulds of rhombiferan isolated plates: mail?url=http%3A%2F%2Fmail.yimg.com%2Fok%2Fu%2Fassets%2Fimg%2Femoticons%2Femo71.gif&t=1656361261&ymreqid=23281213-8dc1-3cff-1ce1-390053017e00&sig=K5dnHxwUL_jeq76lR6_3GQ--~D

 

image.png.c4265edcd7a51de6c56f021859af4095.png

 

Botquelen, A., Le Menn, J., Loi, A. 2006

Échinodermes de l’Ordovicien Supérieur (Ashgill) de Sardaigne et d’Algérie.

[Echinoderms of the Upper Ordovician (Ashgill) from Sardinia and Algeria.]

Geobios, 39(1):13-23  PDF LINK

image.png.a84de26dad44fb03836a743755df237c.png

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