Help With Wisconsin Mystery Fossil

[RCFossils]

I had a chance to collect an Ordovician aged roadcut in Southwestern Wisconsin (Platteville Formation).

i found this unusual spiral shaped fossil and was hoping someone on the forum might recognize what it might be.

It measures approximately a centimeter across.

 

[Tidgy's Dad]

I'm really interested in this beautiful specimen. 

I'd be at it with a pin-vice.

I don't know the fauna found here, but if it's a cephalopod, the only one I know in the Upper Ordovician which sometimes has bifurcated ribs is Discoceras. 

[KimTexan]

I think that will turn out to be a coral of some kind.

[RCFossils]

Thanks for the quick replies but I think i was able to answer my own question. I remembered an old post "A Whole Lot Of Platteville" by Caleb who unfortunately passed away several years ago.

He had pictured an unusual gastropod that he had identified as Ophiletina sublaxa that seems to be a match.

 

 

[minnbuckeye]

@RCFossils, Thanks for bringing to light the type of gastropod you found. I have stumbled onto these in the past and could never ID! Here is a picture of two Ophiletina sublaxas that I found 2 weeks ago in SW Wisconsin, Platteville/ Ordovician. Now I can put a name to them.  

 

Mike 

 

 

[FossilDAWG]

That is a great looking gastropod plate! 

 

Don

[minnbuckeye]

15 minutes ago, FossilDAWG said:

That is a great looking gastropod plate! 

 

Don

Thanks, pics are poor due to dismal dark, drizzly weather.

[Fossildude19]

10 minutes ago, minnbuckeye said:

Thanks, pics are poor due to dismal dark, drizzly weather.

I agree - lovely hash plate, Mike. 

Looks fine to me.  

 

[minnbuckeye]

23 minutes ago, Fossildude19 said:

I agree - lovely hash plate, Mike. 

Looks fine to me.  

 

 

Now that you improved my photo, I think there are three, right in a row, papa bear ,baby bear, and momma bear.

[dalmayshun]

hash plates are really lovely, as is the original fossil posted. I am curious as to size, dime, quarter, 1" ???

[minnbuckeye]

2 hours ago, dalmayshun said:

I am curious as to size, dime, quarter, 1" ???

 

@dalmayshun     Actually the one on the right measures exactly 1 cm.