Possible Isotelus fragments

[Alexthefossilfinder]

Hey everyone, it's been a while since I posted but I'm revisiting some of my material that I didn't ID. I found this rock underneath of a highway, so I can't confirm an exact location or period of origin but I'm going to make a guestimate that it's Upper Ordovician as I found it in Southern Ontario on the Georgian Bay Formation.

 

This first picture I honestly have no idea what it is, the only thing that comes to mind is the rough shape of a jellyfish although I highly doubt that.

The next pic I want to draw attention to is this one where I've circled the main point of interest. I believe it's a trilobite genal spine, probably Isotelus, although I haven't narrowed it down to a species yet. There's a few other potential bits there, such as the but to the far left, which kind of resembles part of a crinoid stem. Something else I noticed is around the area where the trilobite's body would have been (assuming it's a trilobite at all), the rock is a bit smoother than everywhere else. It doesn't show up too well in the pictures but you can feel the difference when you run your fingers over it. The rest of the pictures are just different angles and lighting of the same specimens.

That's the majority of what I wanted to show today, hopefully some more finds will come soon!

[Isotelus2883]

The second item is the partially exposed ventral surface of an Isotelus fragment, probably pygidium. The Georgian Bay Isotelus are I. maximus.

[Alexthefossilfinder]

12 minutes ago, Isotelus2883 said:

The second item is the partially exposed ventral surface of an Isotelus fragment, probably pygidium. The Georgian Bay Isotelus are I. maximus.

Pygidium? So the similarity in shaping to the genal spine is a coincidence then. No matter what it is it's the largest trilobit I've found so I'm happy!

[Isotelus2883]

This is how I think it’s oriented.