Isotelus

[Pseudogygites]

I found this last month on a visit to an abandoned limestone quarry near Naponee, Ontario.  Though I am not very familiar with the Trilobites of this area, I believe it's an Isotelus. If I'm wrong with this identification, please tell me. It looks like there could be more of it underneath the sediment, and there is some matrix covering the pleura. This limestone is flaky and darker than any I have seen before. How would I go about prepping this? Though I've heard many people use sand, should I use something less abrasive, like baking soda? Thanks for the help.

[Fossildude19]

I don't think this is an Isotelus.  

Some prep would be needed to tell what it is, I think. 

I'm guessing this is Ordovician in age?

 

Dolomite or baking soda would be the media I would try prep this.

Start with the Baking soda. If it isn't working, then try the dolomite.

 

 

Maybe @Northern Sharks @FossilDAWG @piranha or @Kane will have some insights for you. 

[Malcolmt]

That is not an isotelus it is an Ordovician  flexicalymene of some type or other. Hard to tell what from the pic would need a better pic or prepping to know. If I was prepping that knowing it was from generally the Kingston area I would be using dolomite. You are aware that those of us who are doing prep work on this type of fossil are using fairly expensive equipment 

[Northern Sharks]

I was thinking maybe a Calyptaulax callicephalus. The pygidium, to me anyway, doesn't look like a Flexi and it certainly is not an Isotelus.

[Malcolmt]

Kevin, you could be right really hard to tell much from the pic but definately not an isotelus

[FossilDAWG]

The axis of the thorax is far too arched and well defined to be an Isotelus, and the pygidium (what can be seen of it) it too large relative to the width of the thorax to be a Flexicalymene.  Beyond that we are in guessing territory given the quality of the fossil and the photos.  Sometimes lightly wetting the rock helps with the contrast, and also you can see if oblique lighting can generate shadowing that enhances any structure on the pygidium.  

 

Don