Gastropod

[grg1109]

I found this Gastropod in the same rock as the topic ("no idea what so ever").  Tully Limestone, Cortland Cnty., Central New York, Middle Devonian.  This one is a bit different.  I think the id is: Platyceras carinatum(from the "Field Guide to Devonian Fossils" page174-175).  Am I close?  Approx. 29mm or 1 1/8" long X 13mm or 9/16" wide.

Thanks

Greg

[Thomas.Dodson]

It definitely looks like a Platyceras. I don't have experience with the Tully so I can't assign a specific ID but you're definitely close, maybe spot-on. Maybe someone else will know how many other, if any, Platyceras are reported from there and their differences.

[grg1109]

Thanks.  And then there is that object on the side with the blue arrow.

Greg

 

I think it's a small Brachiopod now

 

 

[Jeffrey P]

I agree that's Platyceras, but not carinatum since according to the guidebook that species is restricted to the Onondaga Formation. The profile also looks off though I do see some similarities to carinatum. I looked through my own sources and wasn't able to produce a certain match.  A cool and very interesting looking specimen. Congratulations on finding it. 

[grg1109]

Am I correct in assuming that(in the PDF "Devonian Paleontology") that the larger the illustration...the larger the fossil?  And would that also be the same for (in Gastropods) that the larger the opening in the illustration...the larger the opening in the fossil?

 

This Gastropod has strong ridges on the sides and lesser pronounced ridges between them, the central ridge is the broadest becoming more pronounced at the curve of the tip...there are 4 ridges that I can see, but if it is symmetrical there should be 5.  The "sepiae"(?) changes direction from the ridges and "grooves". 

Cleaned up a bit more

Greg

 

 

 

 

 

[grg1109]

Could it be...Platyceras rarispinum...I did not find it in the "books" that I have...but, doing a search on this site.  Perhaps I destroyed the upper whorls. The main body looks similar except for the bumps...but, I'm not sure if they are part of the fossil or some other thing that attached itself to the Gastropod.

Greg