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What could this be? Just a rock or a fossil as i have theorized. My guess is that it could be a kind of marine fossilized arthropod, with fossilized inner organs, i know it is not very common but thats what makes more.sense to me.

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It was found in the rivershore in Bilbao, in lower cretaceous sediments, i found some sea-urchin fossils there too.

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Thanks a lot!

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Well, we can definitely rule out trilobite if this was found in Cretaceous rocks given that they went extinct by the Permian. Internal organs very rarely fossilize outside of Konservat-Lagerstatte sites, and even then the preservation does not generally favour much more than some rudimentary features (such as legs, antennae, alimentary canal). Perhaps show us some individual images at a larger size to help us make out what these may be.

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Welcome to the Forum. :) 

Unfortunately, I am not seeing any kind of fossil here. :( 

After dealing with rocks and fossils for 25 years, I can say with confidence that coincidental and odd looking shapes are much more commonly found than soft tissue preservation fossils. 

Regards,

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Hello, and a very warm welcome to TFF from Morocco! :)

There may be something there, but only close ups would allow us to see what it is. 

Can't see soft tissues being preserved in this sort of rock though. 

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5 hours ago, Kane said:

Well, we can definitely rule out trilobite if this was found in Cretaceous rocks given that they went extinct by the Permian. Internal organs very rarely fossilize outside of Konservat-Lagerstatte sites, and even then the preservation does not generally favour much more than some rudimentary features (such as legs, antennae, alimentary canal). Perhaps show us some individual images at a larger size to help us make out what these may be.

Thanks for the answer. Its difficult to upload good images with the size limit, here goes a better one. The segments aren't very easly apreciated on the fotos thats why i draw them with red. Having the rock in front they are very easily recognisable. One of my guesses is that it could be a Horseshoe crab. I took it from a very mineralised sediment witj ferric and pyrite fossils and nodules.

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I know soft tissue is conserved in rudimentary ways but this seems to me a lot like the gut and the nerve cord of the creature, and the structures that were inside the shell. Its driving me crazy trying to find an answer.

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2 hours ago, Tidgy's Dad said:

Hello, and a very warm welcome to TFF from Morocco! :)

There may be something there, but only close ups would allow us to see what it is. 

Can't see soft tissues being preserved in this sort of rock though. 

Hey thanks a lot for the answer!!! i've just uploaded some other photos :)

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5 hours ago, Fossildude19 said:

Welcome to the Forum. :) 

Unfortunately, I am not seeing any kind of fossil here. :( 

After dealing with rocks and fossils for 25 years, I can say with confidence that coincidental and odd looking shapes are much more commonly found than soft tissue preservation fossils. 

Regards,

Hey thanks for the answer, sure you understand a lot. It's the fact that the segmented lines + the whole shape + the inner mineralized structures + the fact that i found pyritized sea urchins in the area. I know it may be a rock, but althought it is not common to find soft tissue in fossils, i think i must take it into consideration.

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Much better pictures, thanks! 

It seems to be a rock with interesting veins of pyrite (gold) with inclusions of jasper (red) and haematite (black). 

Can't see any fossils, I'm afraid. 

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3 minutes ago, Tidgy's Dad said:

Much better pictures, thanks! 

It seems to be a rock with interesting veins of pyrite (gold) with inclusions of jasper (red) and haematite (black). 

Can't see any fossils, I'm afraid. 

Thanks!!! I don't have any studies on geology so i trust on your answers.

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