dbrake40 Posted October 16, 2023 Share Posted October 16, 2023 (edited) Is this the inner whirl of an ammonite or something else? This was found in Northern Minnesota Coleraine Formation. Sorry limited photos as it was donated to the Hill Annex (mine) Palaeontology Project Edited October 16, 2023 by dbrake40 Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted October 16, 2023 Share Posted October 16, 2023 The internal cast of a bivalve, I think. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
dbrake40 Posted October 16, 2023 Author Share Posted October 16, 2023 3 hours ago, Tidgy's Dad said: The internal cast of a bivalve, I think. I think I did find one of those also. But this does look different unless its a quite different species. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted October 16, 2023 Share Posted October 16, 2023 Yes, different species have different internal shapes. Put "bivalve internal cast" into Google and you'll see a variety including some like yours. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
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