Tennessee

Very nice indeed.
And, yes, the lophophore is an organ and soft and does not preserve except in exceptional circumstances.
The supports for the lophophore are what are sometimes preserved.

Thank you! This was a site I hunted a few times when I was a kid and my "starting" area. Sadly most of it is now overgrown but it's still producing good finds. Also I have now corrected the terminology, as I wasn't too familiar with internal preservation and anatomy. I have now uploaded it in the album!

Awesome plate. Have always wanted to collect a slab of those from that locality, but I haven't had a chance yet to get back and collect around the KC area. Look forward to seeing the brachiopod with the brachidium.

Correction (May 6, 2024):
 
I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
 
Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

Correction (May 6, 2024):
 
I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
 
Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

Correction (May 6, 2024):
 
I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
 
Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

Correction (May 6, 2024):
 
I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
 
Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

Correction (May 6, 2024):
 
I would more accurately list the inclusions (workers and alates) in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
 
Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

Correction (May 6, 2024):
 
I would more accurately list this specimen as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
 
Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.

Sorry for my late response. That's a good observation. The Cockfield Fm. that hosts this amber belongs to the Claiborne Group, which encompasses a great number of different Formations.