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Author Topic: Is this a fossilised crinoid in flint?  (Read 4648 times)

Offline makszkaron

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Is this a fossilised crinoid in flint?
« on: 05/10/2012 11:11:23 »
Hello everyone,

Recently I received a large flint nodule from Eastern Europe. After flaking off a piece of it I saw some kind of strange structure inside:

newbielink:http://www.fotosik.pl/showFullSize.php?id=73f86f8da38e4d0f [nonactive]

What do you think - is this some kind of fossil or rather a mineral inclusion?

And sorry for my English :/
« Last Edit: 11/10/2012 10:06:45 by chris »


 

Offline Mazurka

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Re: Strange finding in flint
« Reply #1 on: 05/10/2012 11:39:44 »
Nice find!

I would say that it is a fossil.

Flint forms as nodules on the seafloor - often around the remains of a creature and I would suggest that this is the remains of some sort of sponge as it does not look like a brachiopod or bivalve
 

Offline RD

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Re: Strange finding in flint
« Reply #2 on: 05/10/2012 13:20:33 »


It could be a mould of a fossil, e.g. like this mold of a crinoid stem below ...

Quote

This  close up exemplifies the mode of preservation seen in most fossils found in the Redwall cherts, a hollow mold formed when the subject dissolves out leaving behind the exact form in reverse. Here we see a small 1/4 inch crinoid stem with its central canal seen as a pillar in the middle.
http://www.schursastrophotography.com/paleo/latest/youngredwall09.html

[ try a specialist forum ...http://www.thefossilforum.com/index.php/forum/14-fossil-id/  ]
« Last Edit: 05/10/2012 14:03:53 by RD »
 

Offline Mazurka

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Re: Strange finding in flint
« Reply #3 on: 05/10/2012 15:55:36 »
Crinoid stem looks like a good choice - better than a sponge (or bryozoan ;))
 

Offline makszkaron

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Re: Strange finding in flint
« Reply #4 on: 05/10/2012 15:59:26 »
Here is a closeup at different angle:

newbielink:http://www.fotosik.pl/showFullSize.php?id=3ce940c11a51bdb1 [nonactive]

Crinoid stem looks like a good choice

I agree.
« Last Edit: 05/10/2012 16:18:09 by makszkaron »
 

Offline RD

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Re: Strange finding in flint
« Reply #5 on: 06/10/2012 10:30:13 »
... (or bryozoan ;))

In my defence there is nothing to indicate scale on the picture, (e.g. ruler, coin)
 

Offline makszkaron

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Re: Strange finding in flint
« Reply #6 on: 06/10/2012 11:46:14 »
Right.

The whole thing is about 3-4 cm (1.2-1.6 inch) in length.
 

Offline RD

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Re: Strange finding in flint
« Reply #7 on: 06/10/2012 12:50:40 »
I'm sticking with mould of a fossil : it looks like it's made of flint ...

 

A specialist fossil forum, e.g.  http://www.thefossilforum.com/index.php/forum/14-fossil-id/ , will be more likely to tell you what it's a mould of.
« Last Edit: 06/10/2012 12:54:50 by RD »
 

Offline bigblock

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Re: Strange finding in flint
« Reply #8 on: 11/10/2012 01:37:29 »
Looks like a harmonica :)  Whatever it is, it sure looks cool. Nice find.
 

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Re: Strange finding in flint
« Reply #8 on: 11/10/2012 01:37:29 »

 

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