Creek finds - Stone county, Mississippi

[pathojenn]

Last weekend I found a few fairly small pieces of fossil, and I am not entirely sure on their identifications, but I have guesses. 

Location: Mississippi creek. (I am unsure on how much to share location-wise, in regards to name of creek, etc.). This area is outside of Hattiesburg, Mississippi.

 

I thought the first one was a piece of wasp nest until I felt it. Some sort of coral? The second is perhaps also coral?

The last one perhaps a crinoid stem? I do note there is a circular fossil next to it. The last one looks pretty distinctly like a shell impression.

 

Any tips or suggestions are much appreciated. I keep doubting myself when I think I've figured them out.    

 

Edited May 1, 2023 by pathojenn

[Ludwigia]

In my opinion you are right on with your first an third guesses. The circular fossil in the 3rd photo is a crinoid columnal. The second one is not coral, but may be oolites. And I'm inclined to think that the last one is a chunk of coral, but I'm not quite sure, so let's wait for a few more opinions.

[FossilNerd]

I think Ludwigia is on the right track. 
 

Your last fossil appears to be the cross section of a worn solitary rugose “horn” coral to me. Specifically the calyx (sometimes spelled calice) with the vertical lines being the septa.
 

[pathojenn]

Thank you both so much!