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Egg or tooth?


MrBones

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Hello!

I found this very odd fossil while scratching on Jebel Hafeet, Al Ain, United Arab Emirates. I came across it while brushing sand off of a layer of compacted sand. The fossils are eocene in age. I have found many urchins in the same location (including Schizaster and Echinolampas ovalis?). 

At first I thought it might be a tooth, since the exposed side looked similar to the backside of a crocodile's tooth, but upon further inspection I noticed that the fossil had a thin, asymmetric covering. This made it look more like an unpopped popcorn kernel. 

I hope you'll be able to make sense of this for me!

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1 hour ago, Tetradium said:

Nope. Concretion.

:headscratch: I don't know. The texture ? ' hard to imagine there wasn't something more to it.

 

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1 hour ago, MrBones said:

Is it possible to have such thin concretions?

It is. The evident concentric layering is what makes me think 'concretion' right away. It's an interesting geologic oddity; I'd have picked it up myself.

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58 minutes ago, Auspex said:

The evident concentric layering is what makes me think 'concretion' right away.

The contours and texture of the other side misled me then. :shrug:

It is beginning to look it. :shakehead:

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16 hours ago, Auspex said:

It is. The evident concentric layering is what makes me think 'concretion' right away. It's an interesting geologic oddity; I'd have picked it up myself.

I appreciate the response. It sure is interesting, but I'm still not 100% convinced though. The middle "shell" appears to be slightly oblong. And also has a more or less clean "break" where the thin layer turns white. It also appears to be off-center, and almost touches the outer shell on the one side. I also want to make it clear that I used paraloid to hold the sand in place. The sand inside of the object looked about the same as the sand covering it. I am not an expert, especially not on concretions. Maybe this additional information would even further support the concretion id.

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Fossildude19

+ 1 for concretion.

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