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Cassandra Tiensivu
Posted (edited)

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! 

1A10AA68-687C-49F8-A9D1-8111153CCEC8.jpeg

04F90AB2-5C99-4556-A626-B16B6030C4B3.jpeg

D42FEDF9-A86A-40DE-88B7-60595D9C8B85.jpeg

90083403-18DD-4BFC-B91E-1F30773BC139.jpeg

479D6953-FFC6-4B6E-8144-DBC3FD5B25DF.jpeg

Edited by Cassandra Tiensivu
Fixing my number indication for which photo was the host stone as the upload changed the order for some reason.
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 Lower Mississipian Cephalopods of Michigan .ID118.pdf

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piranha

Beyrichoceras allei  is the most similar match from Miller & Garner 1955: mail?url=http%3A%2F%2Fmail.yimg.com%2Fok%2Fu%2Fassets%2Fimg%2Femoticons%2Femo71.gif&t=1621110448&ymreqid=23281213-8dc1-3cff-1cee-9f0101018400&sig=Wrjwn9wpCljrq1nc9DgZDg--~D

 

image.thumb.png.64479c86bb95270bebd9929f6c76c146.png

 

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

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Cassandra Tiensivu
18 minutes ago, piranha said:

Beyrichoceras allei


Thank you very much! 

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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.

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