Goniatite in Coldwater Shale

[Cassandra Tiensivu]

Hey everyone. I’m looking for more information on Goniatites found in the Mississippian Coldwater Shale. I found this little guy today after cracking open another packstone (second to last photo shows the host stone) I picked up in South Haven, Michigan, along the shores of Lake Michigan. 
 

Any insights you could toss my way would be greatly appreciated. Thanks so much for your time! 

Edited May 15, 2021 by Cassandra Tiensivu
Fixing my number indication for which photo was the host stone as the upload changed the order for some reason.

[aek]

 Lower Mississipian Cephalopods of Michigan .ID118.pdf

[piranha]

Beyrichoceras allei  is the most similar match from Miller & Garner 1955:

 

 

Miller, A.K. & Garner, H.F. 1955
Lower Mississippian Cephalopods of Michigan. Part III. Ammonoids and Summary.
Contributions from the Museum of Paleontology, University of Michigan, 12(8):113–173  PDF LINK

[Cassandra Tiensivu]

18 minutes ago, piranha said:

Beyrichoceras allei

Thank you very much! 

[PaleoOrdo]

The second rock seems to have several small coral on the left side, the bigger form maybe rugose coral too or a bryozoan, but it is unclear, I believe because of recrystallisation with bigger grains of crystal.