Shell fossil or imprint?

[Partyjam3]

Found this in the same stream I found the bone in Apopka FL I see the shell on one side but it’s weird on the other

[Norki]

This is most likely the internal cast of one half of a bivalve. The shell was buried and filled with sediment, which then lithified, before the shell material dissolved, leaving this imprint.

Edited March 23, 2021 by Norki

[Tetradium]

10 hours ago, Norki said:

This is most likely the internal cast of one half of a bivalve. The shell was buried and filled with sediment, which then lithified, before the shell material dissolved, leaving this imprint.

Oh you means like the other side are the bore remains of other invertebrates scavenging the shell for edible proteins. 

[minnbuckeye]

https://uhlibraries.pressbooks.pub/app/uploads/sites/6/2019/06/Dissolution-internal-mold.jpg or 

 

[abyssunder]

It looks like the internal mold of the bivalve has borings on both sides, especially on the flat one. Entobia could be a possibility. Better pictures could reveal more details.

Edited March 23, 2021 by abyssunder

[DPS Ammonite]

6 hours ago, minnbuckeye said:

https://uhlibraries.pressbooks.pub/app/uploads/sites/6/2019/06/Dissolution-internal-mold.jpg or 

 

I like this diagram. Where did it come from; the link leads to photo of a steinkern.

[minnbuckeye]

@DPS Ammonite, University of Houston, Story of the Earth, Chapter 6. Sorry!! I thought I had cited this but must have grabbed the wrong thing.

[SergPono]

I think this is an actual fossilized part of a bivalve shell that has tunnels (Entobia trace fossils) bored by some marine creatures. See, for comparison:

[3battalion]

Thanks diagram is very helpful - thanks

 

Paul

[ChristineR]

On 3/23/2021 at 7:37 AM, minnbuckeye said:

https://uhlibraries.pressbooks.pub/app/uploads/sites/6/2019/06/Dissolution-internal-mold.jpg or 

 

Thank you for posting this. Internal mold is used so frequently, I get confused.  I’ve often wondered how the external ornamentation can be captured by an internal mold.