Jump to content
jmay

Great but unidentified fossils from Kankakee River

Recommended Posts

jmay

Found all three of these at different times in Kankakee River State Park in Illinois. In the river. 

 

Two of them were just laying out. I got the other one hammering rocks. The rock it was embedded in was kind of a medium sandstone.

 

(EDIT - I'm just attaching two because of the MB limit. You can see one of them from two different angles, including the interesting stuff in the middle, and the other from a single angle. I can post more if needed).

 

I'm fascinated by the three-dimensional quality of these. The one - you can see pretty well - even seems to have some internal structure visible, looks like a notochord, but who knows.

 

Anyway, at first I thought that I had Tully Monsters, until I learned those are never found in this form or location. Then I thought maybe I had ammonites, but apparently those are very rare in the Midwest, so I'm not so sure. 

 

What do we think?

IMG_2882.thumb.JPG.81f4a2f7774f9dbeab15d9727c1fd241.JPGIMG_2881.thumb.JPG.c3179c4653e3be6d0a738c7deb8e3243.JPG

Share this post


Link to post
Share on other sites
Kane

Welcome to the Forum. :) 

 

The first piece looks like an orthoconic nautiloid. Not sure about the second piece, which could be a concretion.

Share this post


Link to post
Share on other sites
Fossildude19

Welcome to the Forum. :) 

 

The second piece could be the siphuncle of a large orthocone cephalopod. 

You might check out Rob Russell's cephalopod gallery.

I believe he is from that area. 

Regards,

 

I took the liberty of cropping, turning, and brightening your photo.

 

IMG_2882.JPG.954f5ebf3137e1fc93322a216f1ec74d.JPG

Share this post


Link to post
Share on other sites
Innocentx

Some forum info regarding your find:  

 

Share this post


Link to post
Share on other sites
deutscheben

I agree with the others that these two pieces are both cephalopods, most likely Silurian in age. These are not particularly rare in Illinois, and can be found at a few different sites, but they are still neat! You should post your other find in here as well.

Share this post


Link to post
Share on other sites
Rob Russell

Your First photo is a piece of Dawsonaceras cephalopod.  The second appears to be a  siphuncle of a larger cephalopod, as Tim mentioned.  And Your third pice may be a cross section of a burrow or another cephalopd.  

All Silurian in age, and from the Sugar Run formation. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Recently Browsing   0 members

    No registered users viewing this page.

×