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Is this a fossil? From Guinea


davidduarte

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Dear friends,

 

I've met a very nice man that has kept a stone very well hidden as he thinks that it could have some value.

I don't understand what it is, but it came into my mind that it can be a fossil.

 

Can you help to indentify it?

 

Thank you very much.

 

Best regards,

David Duarte

IMG_20190104_115750.jpg

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I don’t really see anything that would scream a fossil. If it is a fossil it would be a stromatolite but I don’t think that’s what you have. It looks a lot like a concretion rich in iron. Almost has the look of the “banded iron formation”

Do you know where it is from?

 

Al

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This looks non fossil to me. 

Mineral of some sort, I would guess.

@ynot

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It's easier for me to imagine this pattern precipitating from solution so I'm going with igneous on this one.

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3 minutes ago, ynot said:

Looks like an iron concretion to Me.

What causes the conflicting angles ? A slower form of crystallization ?

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2 minutes ago, Rockwood said:

What causes the conflicting angles ? A slower form of crystallization ?

Bedding planes and cross bedding of the parent rock.

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Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

My Fossil collection - My Mineral collection

My favorite thread on TFF.

 

 

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12 minutes ago, ynot said:

Bedding planes and cross bedding of the parent rock.

A chaotic sedimentation followed by a period of quiescence when the concretion formed ? 

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12 minutes ago, Rockwood said:

A chaotic sedimentation followed by a period of quiescence when the concretion formed ? 

That is My interpretation of this rock.:D

Darwin said: " Man sprang from monkeys."

Will Rogers said: " Some of them didn't spring far enough."

 

My Fossil collection - My Mineral collection

My favorite thread on TFF.

 

 

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14 minutes ago, ynot said:

That is My interpretation of this rock.:D

Probably better than mine.

The iron I've been working on this winter has only been cast for seventy years.

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conccrossbeds-58b5aba15f9b586046a6a7d4.jpg.c080251709b4eb4b4575af6f2d2320aa.jpg

concretion with crossbedding, Montana
 Photo courtesy Ken Turnbull, Denver, Colorado.

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