Pippa Posted April 16, 2020 Share Posted April 16, 2020 I would love your opinions on these Lake Michigan, IL beach finds. Am I correct in thinking that these are crinoid calyces? As always, thanks so much for your input. A Hash rock with a terribly worn crinoid but with the outline of its calyx visible? The cup shaped (bottom part only?) of a crinoid calyx? Upside down view. Ca. 1cm wide View of the bottom Top view: Plate from the IL Geological Survey: Or something like this silurian crinoid "Sagneocrinites Expansus": 1 Link to comment Share on other sites More sharing options...
Shamalama Posted April 16, 2020 Share Posted April 16, 2020 I can't help you on ID's since you don't know the formation they came from, but I can say that the second thru fourth pics are indeed of a calyx of some sort. It's very small if only a cm across. 1 -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
Pippa Posted April 16, 2020 Author Share Posted April 16, 2020 23 minutes ago, Shamalama said: I can't help you on ID's since you don't know the formation they came from, but I can say that the second thru fourth pics are indeed of a calyx of some sort. It's very small if only a cm across. It's from the Racine formation. I agree, it is very small, but I'm assuming that the top of the "bulb" was broken off and what I have are only the basal plates. I might be totally wrong about that of course. Ha, what do I know, I've only started collecting fossils sometime last summer. At any rate, this is very exciting indeed. Thanks so much! Link to comment Share on other sites More sharing options...
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