ToniaM Posted March 5, 2023 Share Posted March 5, 2023 I was on a walk and this rock had broken away from the bluff and was on the trail. Does anyone know what the fossil is? Link to comment Share on other sites More sharing options...
Darktooth Posted March 5, 2023 Share Posted March 5, 2023 Well you have a couple different fossils on your specimen. The long straight one that tapers down to the end is a nautiloid. At the end of the nautiloid appears to be a internal mold of a gastropod. Above the gastropods there is another circular object, but not sure what that is. 1 1 I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
rocket Posted March 5, 2023 Share Posted March 5, 2023 1 hour ago, Darktooth said: Above the gastropods there is another circular object, but not sure what that is. I am sure it is a gastropode, too. A single whorl 1 Link to comment Share on other sites More sharing options...
Darktooth Posted March 6, 2023 Share Posted March 6, 2023 4 hours ago, rocket said: I am sure it is a gastropode, too. A single whorl I was thinking the same, but wasn't 100% sure. I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
minnbuckeye Posted March 6, 2023 Share Posted March 6, 2023 Nice piece of matrix!! Looks like rocks from the Galena / Ordovician period (holey limestone). So the bluffs mentioned were along or close to the Mississippi? @Darktooth points out a large single whirl of a gastropod. Below it is a second gastropod split in half 3-4 oval structures lined up. Both are likely partial Hormatoma gastropods. To identify the cephalopod, look at the end of it and see if you can identify a siphuncle, a round tube these creatures used to adjust their buoyancy. It should look round if present and helps to identify species depending on size and location. Mike 1 1 Link to comment Share on other sites More sharing options...
ToniaM Posted March 7, 2023 Author Share Posted March 7, 2023 Thank you all. Yes MinnBuckeye Mississippi at Dubuque. Link to comment Share on other sites More sharing options...
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