Possible Isotelus piece or coiled cephalopod from St. Leon roadcut

[Harrison Smith]

I recently went to the famous St. Leon roadcut for the third time. The previous two times were more exploratory with few good finds to speak of, especially in regards to trilobites. I had a much more fruitful time this trip, including 2 complete rollers and 2 and a half prone flexis (my sister found a gorgeous one). I also came across this plate, where I saw the fossil in the bottom middle that is the subject of this post.

 

At first I thought it was part of a coiled cephalopod, which I hadn't found at this site before. The other fossil, that I'm fairly certain to be a cephalopod, on the left in the previous picture also lead to that conclusion.

 

 

However the plate is also covered in Isotelus pieces, which I am not very familiar with. And from looking at Isotelus specimens, I was wondering if it could be part of the thorax or something.

 

Here are some other pictures of the plate, if there's anything else on it that's interesting, let me know. It's mostly a mash of trilobite and crinoid pieces, with some gastropods mixed in, as far as I can tell.

 

[Kane]

I think I see an Isotelus pleural bit.