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While cleaning some fossils this week, I came across this large hypostome. Its size would lean me towards Isotelus, but it just doesn't look right. Is it a different species?? Did anyone notice the SMALL hypostome on top of the large one? Any thoughts on it? Thanks for looking. It was found in the Platteville, Ordovician of SW Wisconsin.

The preservation isn’t the best. Broke open a big piece of dolomite with a nice brachiopod. Found that I had shattered whatever this is and exposed some nice silicified chain coral. It’s sorta a hemisphere with internal structures. My best guess would be some sort of echinoid. Silurian Wisconsin, Hartung quarry

Never thought I'd see the day where I would hold one of these. But that day came this Saturday when my girlfriend found this. Location: SW Wisconsin Sinnipee Group- Platteville fm Age: Ordovician Total shell Length: 25 in/ 63.5 cm Total diameter of living chamber end: 6.98 cm Living chamber end siphuncle diameter: 2.22 cm Total diameter of tapered end: 3.49 cm *note the tapered end has matrix, however it was still able to be measured semi accurately. Tapered end siphuncle diameter: 1.27 cm The siphuncle appears to be off center. However there is extensive wear, so I'm not sure if it's a result of environment or an attribute of the shell. Much of the shell exhibits a ribbing texture from the septa. They are angled, and not perpendicular to the ends. Apologies for the difficult lighting, I tried to excentuate this trait with an illustration. The ridges formed from the septa appear to sit around about a 15° angle. This feature runs the length of the shell, and I was able to count 82ish from both ends completely. Again, in most parts of the shell it's very hard to capture in images, so I've tried to show it in some form as much as possible. I would love any help on this, I've tried to be as meticulous as possible.

I was cleaning up my Platteville finds from last fall and came across this. It in all likelihood is an ichnofossil but if anyone have additional thoughts about it, please reply!! The Platteville has plenty of trace fossils but I have yet to see one with this appearance. Would love to have an idea of it's maker.

This is my third and final request for an ID today!!! I lean towards this being a trilobite. If there is doubt, I will use a hammer to help expose this. If it is likely a trilobite, I will work on it in a little less physical way. It was collected 2 weeks ago in SW Wisconsin, Platteville Formation, Ordovician. Mike

Is this what it appears to be??? LOL