Need help ID

[Sarah S]

Found these rocks/ fossils in Galena IL. Northwest corner of state.  Does anyone have any experience in identification?

Thanks for looking.

 

 

 

 

 

 

 

 

[Top Trilo]

Image 1, 5 and 7 are parts of straight shelled cephalopod. Due to the preservation I don't think you can get a more specific ID however someone more familiar with your area might be able to tell you the age. 

Image 4 may be something but I think a clearer photo is required

Image 6 may be a burrow, may be a concretion, not sure.

The others look like weathered rocks.

[Sarah S]

Thank you! Any information is great! I'll do some more looking!

[Praefectus]

 

This is some sort of cephalopod, I think. Let me tag some of the other Midwest collectors to see their opinions @Nimravis @stats @connorp.

[connorp]

5 hours ago, Top Trilo said:

Image 1, 5 and 7 are parts of straight shelled cephalopod. Due to the preservation I don't think you can get a more specific ID however someone more familiar with your area might be able to tell you the age. 

Image 4 may be something but I think a clearer photo is required

Image 6 may be a burrow, may be a concretion, not sure.

The others look like weathered rocks.

Yes I agree with all this. The cephalopods are all too fragmentary to get any more specific of an ID in my opinion.

 

Most of Jo Daviess County is Galena Group (dolostone), so the preservation of fossils is usually not too great. Almost exclusively molds, rarely with any original shell preserved. There are scattered Maquoketa Group outcrops in the area too. Almost the entire group grades to shale in the NW corner of Illinois and the preservation quality is good. Lots of brachiopods and asaphid trilobite fragments, although some upper units are completely bare of fossils. There are also some Silurian rocks capping the Maquoketa, but again all dolostone so not great preservation.

[Sarah S]

Thank you for the information! So interesting!