What is this fossil?

[lukkey]

I found this fossil and cant tell what or is and would like to know.

[Tidgy's Dad]

USA is not very helpful as a location. I have never been there but understand it's quite large. 

A proper scale would be useful too. 

 

However, it's the end of an orthoconic nautiloid of some ilk. 

 

[Manticocerasman]

I agree with Adam, it is part of an orthocone from a cephalopod.

[Coco]

Hi,

 

I agree with what was said earlier. However, for your future photos, please read my last link in my signature and do the right thing.

 

Coco

[tombk]

Nice piece of an orthocone. 

[Mark Kmiecik]

Nice one! Also, if you scroll down the main page, not far from the top you'll find a topic titled "Fossil ID" (where this post belongs, admin will probably move it there, so if it's not here, that's where if went ). Look through a couple dozen posts there and you'll probably see a couple more orthocone nautiloids. They lived and died by the millions and are therefore quite common anywhere marine strata is found.