Jump to content
Sign in to follow this  
halfchino

Circular Donut Shaped Fossil - Lake Erie Shore, Northwest Ohio

Recommended Posts

halfchino

I need help identifying this donut / rollerskate wheel shaped fossil embedded in rock. I do not know for sure the type of rock, but could be limestone. Size is approx. 3.5 inches across. Any tips are appreciated. Thanks.

post-10356-0-34702900-1351981889_thumb.jpg

Edited by halfchino

Share this post


Link to post
Share on other sites
Indy

My first impression is snail ...

Share this post


Link to post
Share on other sites
Fossildude19

What is the size of the specimen?

Regards,

Share this post


Link to post
Share on other sites
Bev

My guess would be a snail also. Have you tried using something like Limeaway to clean it up a bit? Sometime that will give just enough cleaning to help with identification. :)

Share this post


Link to post
Share on other sites
Rockwood

The donut would be an internal cast, a steinkern. The identifying features are most often on the external surface. They would show on the outside of the mould surrounding it.

Share this post


Link to post
Share on other sites
halfchino

Thanks for the tips guys. Unfortunately, it was embedded in a rather large rock that was too heavy to carry away from the lake. I've got to go back with a chisel and hammer to extracate it before the weather turns to snarge up here!

Share this post


Link to post
Share on other sites
Indy

Thanks for the tips guys. Unfortunately, it was embedded in a rather large rock that was too heavy to carry away from the lake. I've got to go back with a chisel and hammer to extracate it before the weather turns to snarge up here!

The matrix looks like chert ...

Tricky to break out fossils from boulders without splintering fossils

Share this post


Link to post
Share on other sites
Herb

I don't know what part of Ohio you are in but it looks like a Silurian gastropod in Niagarian dolomite. Found pretty much anywhere north of Dayton to Michigan border along either side of I-75.

Edited by Herb

Share this post


Link to post
Share on other sites
BobWill

The picture suggests snail because the doughnut looks a little wider on the left and the right side seems to dip under the other side beneath the matrix. It's not easy to tell from a picture though and because you initially described it as a wheel or doughnut it may help if you could confirm whether it seems to make a spiral like a corkscrew or is flatter than it looks in the pic.

Edited by BobWill

Share this post


Link to post
Share on other sites
Herb

The closest thing I can think of for gastropods of that size is Platystoma sp. in the Silurian, I've seen them up to 5" diameter?

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

Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

×