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Expert urgently needed! Found a very intriguing fossil by the river in Puerto Rico


GallinaPinta

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So after hurricane Maria at Puerto Rico, I got curious about the small river down the mountain of my backyard so I went down to explore it. To my surprise some boulders tumbled down due to a soil erosion so I started exploring the scene. I found a few rocks that are actually some very peculiar fossils. The thing is that I don't know anything about fossils in PR so I'm going nuts trying to figure it out! Is it some kind of fish? But it's too big to be a fish and the bone-like structure is quite solid. Professionals and expert paleontologists, please help!

 

image.jpeg

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Hi,

 

By seeing the first pic, perhaps it could be an oyster.

 

Coco

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20 minutes ago, Coco said:

Hi,

 

By seeing the first pic, perhaps it could be an oyster.

 

Coco

Could it be?? How old would it be? I have more pics as well 

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Yes, could be a part of oyster, but we have to wait more informed members... I can't tell your for the age.

 

Coco

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6 minutes ago, Coco said:

Yes, could be a part of oyster, but we have to wait more informed members... I can't tell your for the age.

 

Coco

That same rock with the oyster also has something on the top, like some kind of hole that was filled with dirt. It's shiny around it as if it was a cartilage or a bony structure 

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I agree with Coco, pieces of a shell.

The hole with a border is a mineralized cavity within the shell or surrounding rock.

It has none of the characteristics of bone, fish or otherwise.

 

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8 minutes ago, ynot said:

I agree with Coco, pieces of a shell.

The hole with a border is a mineralized cavity within the shell or surrounding rock.

It has none of the characteristics of bone, fish or otherwise.

 

So how old could it be? 

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Just now, GallinaPinta said:

So how old could it be? 

I do not know the geology of  Puerto Rico, You can look up the geologic maps of the area where You found it to determine the age.

 

Look here...

https://mrdata.usgs.gov/geology/pr/

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40 minutes ago, GallinaPinta said:

So how old could it be? 

Probably Cretaceous.

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FranzBernhard
6 hours ago, GallinaPinta said:

image.jpeg

Most of them look like oysters to me, with some resemblance to the genus crassostrea. Shells of this genus can be nearly 1 m long. And this one could have been grown on a coral head. Age: Cretaceous to recent.

Franz Bernhard

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At first I was going to say oyster but I now think rudist as well.  Rudists are bivalves which formed vast reefs in the Caribbean and elsewhere and became extinct at the end of the Cretaceous.  LINK

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Nice finds:dinothumb:

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