dragonpaws Posted June 24, 2022 Share Posted June 24, 2022 (edited) Found these while having a stroll on the beach on the southwestern tip of lake Michigan, in Illinois just south of the Wisconsin border. I am about as novice as you can get, and found this site while trying to figure out what these are... I'm pretty confident that the rings are crinoid stems, unsure about everything else. Hope the pictures are good enough, hard to photograph small things with a phone camera. Mostly curious about the spike shape on this one The smaller one here is the backside of the one above I don't know if these two are fossils, they look kind of crystalline but I don't know enough to say. That same spike shape seems to be super common, there's lots of them This one I am near 100% sure is coral, just unsure of what family or grouping it belongs to Edited June 24, 2022 by dragonpaws Spelling errors, forgot to caption some pictures Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 24, 2022 Share Posted June 24, 2022 3rd and 4th items are Favosites corals. Last one looks like a rugose coral. The sharp item may be an orthocone cephalopod. Cropped and brightened: First large item looks like crinoidal limestone. Cropped and brightened: 1 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
dragonpaws Posted June 24, 2022 Author Share Posted June 24, 2022 1 hour ago, Fossildude19 said: 3rd and 4th items are Favosites corals. Last one looks like a rugose coral. The sharp item may be an orthocone cephalopod. Cropped and brightened: First large item looks like crinoidal limestone. Cropped and brightened: Thank you so much! One other question, the larger favosites coral seems to have been filled in with crystal (the rock is totally dry in the posted picture, the shiny spots are crystals), is there a mineral that normally does that? They are mostly white to dark yellow Link to comment Share on other sites More sharing options...
Fossildude19 Posted June 24, 2022 Share Posted June 24, 2022 Could be calcite or quartz. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
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