is this a fossil?

[Brianp]

I was cleaning out my desk drawer here at work and I found this.  i forgot i had it.  anything worth while? 

found it on a construction site, in Zilwaukee, MI.

 

if you need more photos or close ups, i'll try, this was the best my phone could do.

 

[RuMert]

Bivalve steinkern probably

[Brianp]

Thanks for the reply.  i appreciate it.

 

[FossilDAWG]

I'm not sure of the bedrock geology in that part of Michigan, but there is a lot of Devonian around.  If it is Devonian, it might be a Paracyclas bivalve.

 

Don