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butchndad

What is this?

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butchndad

I am clueless as to what this is (more so than usual).  It doesn’t look like the usual concretions. It doesn’t look like the usual shells. It doesn’t look like a fossil and I’ve never seen coral from Big Brook. It’s 1.75 x 1 inch and the bottom is concave

86C2897B-332D-4036-95A9-17125D99ED7A.jpeg

D3A6434C-A69F-4CEE-8BAD-2C29AE962DBC.jpeg

9567949D-AC63-4E33-975E-3065E0ACA1F8.jpeg

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martwad

That 2nd picture is making me want to say oxidized cast iron.

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Fossildude19

Slag was my first impression.  

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FossilDAWG

I agree with slag.  Not a fossil coral for certain.

 

Don

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Pippa

Backside looks like cast iron. Or could be a shell, as The Jersey Devil suggests.  I'd hold a magnet to it, see if it reacts.

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Plax
12 hours ago, The Jersey Devil said:

This is actually Cliona sponge stuck to the remnants of a steinkern of a shell

Shell dissolved away; cliona representation still there as Jersey Devil says.

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TqB

I agree with filled Cliona borings in a dissolved shell. There are infills of the narrow galleries connecting the chambers.

Screenshot 2020-09-23 at 16.48.34.png

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erose

Yep, sponge steinkern

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DPS Ammonite

I agree with Tarquin. This is the infillings of sponge borings that show galleries and interconnected passages such as that from Entobia. It is a trace fossil and not a body fossil. Thus, it is not a steinkern of a body fossil.
 

See:

 

 

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butchndad
On 9/22/2020 at 1:45 PM, martwad said:

That 2nd picture is making me want to say oxidized cast iron.

 

On 9/22/2020 at 1:57 PM, Fossildude19 said:

Slag was my first impression.  

 

On 9/22/2020 at 2:16 PM, FossilDAWG said:

I agree with slag.  Not a fossil coral for certain.

 

Don

 

16 hours ago, The Jersey Devil said:

This is actually Cliona sponge stuck to the remnants of a steinkern of a shell

 

6 hours ago, Pippa said:

Backside looks like cast iron. Or could be a shell, as The Jersey Devil suggests.  I'd hold a magnet to it, see if it reacts.

 

4 hours ago, Plax said:

Shell dissolved away; cliona representation still there as Jersey Devil says.

 

4 hours ago, TqB said:

I agree with filled Cliona borings in a dissolved shell. There are infills of the narrow galleries connecting the chambers.

Screenshot 2020-09-23 at 16.48.34.png

 

1 hour ago, erose said:

Yep, sponge steinkern

 

51 minutes ago, DPS Ammonite said:

I agree with Tarquin. This is the infillings of sponge borings that show galleries and interconnected passages such as that from Entobia. It is a trace fossil and not a body fossil. Thus, it is not a steinkern of a body fossil.
 

See:

 

 

Thank you all.  I appreciate your input.  Are you sure this is not a dinosaur egg? LOL

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abyssunder

To be honest, I can see the possible variants of your specimen listed, but, probably, I'm not the expert who will be expected to answer to your question.

Trace fossils like Entobia might be a good candidate in my thinking.

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