Cephalopod Fossil or Just a Rock?

[CrinoidConnoisseur]

Hi everyone! I was in SE Minnesota recently, looking through limestone outcrops where I have found cephalopods on a previous trip to Mystery Caves, MN. While looking for more cephalopods during my most recent trip to Fillmore County (and finding a few) I found this piece shown below. The fossil is likely Ordovician aged, as is common in SE Minnesota. The formation I am less sure about, but if I had to make a good scientific guess, it is the Galena formation.

My question is if this is a cephalopod fossil that is just heavily eroded, of is this just a cool rock? I decided to also flip the fossil with my hand to better see the ends. Thanks for the help everyone.

 

[Tidgy's Dad]

Nautiloid.

Pretty nice, sizeable chunk, actually.

[Fossildude19]

Orthocone nautiloid for me.

[JimB88]

It seems to have a worm tube on it too.