Fossil or shell?

[TreasureCatto]

Glad to post again, barely had any luck THunting this past month due to weather and school responsibilities. Today I got to have a day off and have already chosen a public spot to hunt.
In the afternoon by a U-turn crossing under the main highway was a concrete space with wood picnic tables next to the railroad. By the sub-grade and ballast there’s a grass field and drainage tunnel with a number “1915” on a concrete slab up top the tunnels end. Got started by the road and spent 30 minutes on the field.

Expected more out of it. Got only junk cents. 7¢


Interestingly, I found this near the tunnel and appears to be a shell shaped relic.
At first I thought of it would be fossil as it seems to have a rocky composition. But I post this to see what y’all would say.




Any feedback will help. Thanks and happy hunting!

 

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[old digger]

That there is a fossil oyster shell, and a nice one at that!

 

[Indian Steve]

I found several like this in southwest Georgia and was told that they were Exogira Ponderosa and about 200 million years old.

 

[CaptEsteban]

I found several like this in southwest Georgia and was told that they were Exogira Ponderosa and about 200 million years old.

I agree. Look at this picture ;

Central Texas

 

[TreasureCatto]

I found several like this in southwest Georgia and was told that they were Exogira Ponderosa and about 200 million years old.

Wow, The age makes sense as to the U.S. mainland being an ocean 265 million years ago.

I agree. Look at this picture ;

Central Texas

They do look very alike, Thanks for the source!

Thanks a bunch guys!

 

[islamoradamark]

Looks like a fossil to me

 

[scilover]

Wow, nice find you got there! I can’t be 100% sure but I think It's a fossil oyster shell. I can still see the resemblance of it being one originally.