found on beach near Glen Arbor, MI this week

[bertcourson]

I found this fossil while beach combing. Any ideas? Guesses are welcomed too.

[Tidgy's Dad]

Hello, Bert, and a very warm welcome to TFF from Morocco.

Can we have a photo of the right hand side from the first photo, please ?

Interesting specimen. 

[bertcourson]

Sadly, no. The first picture shows the rock in its entirety.

Edited January 29, 2018 by bertcourson

[TqB]

Orthocone cephalopod fragment, with siphuncle down the middle?

[FossilDAWG]

I agree, it is certainly a nautiloid cephalopod with a portion of the siphuncle showing.  A more precise ID would require making a polished section, and even then not enough of the specimen may be left to make the ID.

 

Don

[Ludwigia]

I agree with Tarquin....and Don ...and Adam

Edited January 29, 2018 by Ludwigia

[Tidgy's Dad]

Yes, that's what i was thinking. 

+ 1 for possible orthocone nautiloid cross-section.

 But not quite as big as this one. 

[Herb]

I agree with TqB and all