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Eocene coral or burrow cast? (Florida)


matgerke

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I was inspired by recent posts to visit the canal spoils near Yankeetown, Florida.  I did not, unfortunately, find the echinoid riches described by others.  However, I did find a muddy, suspicious-looking rock, which, when cleaned, looked like this.  Can anyone please help me identify this pretty little coral?

 

Edit: I am told below that this may instead be a burrow cast.  Can anyone help to identify it?20170418_142647.thumb.jpg.a87eac3e9b730f3aa6ea51b12f84eb25.jpg

20170418_142609.jpg

20170418_142520.jpg

Edited by matgerke
Updating burrow cast idea
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I would be more inclined to think it's a cast of some sort of burrow. It actually reminds me more of a cast of an ant burrow than anything else.

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Ah, an interesting idea!

 

But here's the thing: the matrix around it was not very well consolidated -- little more than muddy sand.  After a good soak in water, it loosened up so much that it came completely off with just gentle brushing.  The fossil itself is very hard.  Is that consistent with a burrow cast?

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could be yet another piddock clam tubes with associated cliona borings

  the shell they were boring in is gone leaving the traces alone.

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2 minutes ago, Plax said:

could be yet another piddock clam tubes with associated cliona borings

  the shell they were boring in is gone leaving the traces alone.

Would have been a very thick shell they were boring into.

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3 hours ago, matgerke said:

Ah, an interesting idea!

 

But here's the thing: the matrix around it was not very well consolidated -- little more than muddy sand.  After a good soak in water, it loosened up so much that it came completely off with just gentle brushing.  The fossil itself is very hard.  Is that consistent with a burrow cast?

 

Just because the soil is soft muddy sand now does not mean it was that way ages ago. Water channels change course and what is presently a wet area now may not have been so when that thing was formed. 

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What about some burrowing worm, eating into driftwood?  

 

The bore holes are too small for any ants I've ever seen.

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16 hours ago, ynot said:

Would have been a very thick shell they were boring into.

yes. Looks to be 2x2 iinches? Am liking Abyssunder's speleothem at the moment

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Okay, I've googled lightning strikes, ant burrows, speleothems, and ophiomorpha.  Nothing really bears a close resemblance.

 

Is there another way to start filling some of these out?  Shouldn't speleothems react to acid?

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1 hour ago, matgerke said:

 Shouldn't speleothems react to acid?

Yes, but some others on the list of possibilities could also be calcite minerals.

Can You post pictures of the broken ends of the round parts?

 

I am leaning towards a trace fossil--ie burrow cast.

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