bamontgomery Posted November 17, 2021 Share Posted November 17, 2021 Hi all. I found some pretty cool boulders of calcite littered with crinoid impressions in a public park in Danville, IL back in late August, but left everything until I got approval from their park department to remove them. I finally heard back last month, but didn't get around to going until today. I found a few interesting things that I'll post when they're cleaned up, but I probably won't even begin the process until Thursday. In the meantime I took a photo of a trace fossil that was sitting near the top of one of the specimens. I can identify most of the things in the pieces, but am stumped by this one. I probably should have gotten a ruler for measurement, but I snapped it after picking my son up at school and had to do it quickly. The photo didn't come out as clearly as I had hoped, and can retake it if necessary. It came from Vermillion County, which makes it Pennsylvanian. Any ideas? Link to comment Share on other sites More sharing options...
Rockwood Posted November 17, 2021 Share Posted November 17, 2021 I believe this is actually a mold fossil of a fish dermal plate. Link to comment Share on other sites More sharing options...
Coco Posted November 17, 2021 Share Posted November 17, 2021 Hi, While waiting to obtain a rule, you can print the document provided in the first link of my signature. Coco 1 ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
abyssunder Posted November 17, 2021 Share Posted November 17, 2021 (edited) Maybe it's a crinoid calyx plate (or imprint of a plate). P.S.: If it's a cystoid plate, the geological time is not Carboniferous. Edited November 17, 2021 by abyssunder " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 17, 2021 Share Posted November 17, 2021 Since it was found with other crinoid remains, I would lean towards a calyx plate for this item. 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...
deutscheben Posted November 17, 2021 Share Posted November 17, 2021 That looks like something crinoid-related to me as well. I'll also mention that it is quite likely the stone does not originate from the area- stone from elsewhere in Illinois and Indiana is used frequently in Champaign and Vermilion counties since there is not a good local source for hard rock. 1 1 Link to comment Share on other sites More sharing options...
Rockwood Posted November 17, 2021 Share Posted November 17, 2021 It just struck me as looking like some of the material I collected at Red Hill. I can't check it now to even begin an argument that bucks those odds. Link to comment Share on other sites More sharing options...
cngodles Posted November 18, 2021 Share Posted November 18, 2021 I haven’t found more than two small Pennsylvanian Crinoid calyx pieces myself. But are they usually pitted like that? Fossils of Parks Township - Research | Catalog | How-to Make High-Contrast Photos Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 Okay. Here are my fossil finds and some rocks that I need some help with. Let's start with those calcite finds. There are trace fossils everywhere on these on every side, but I only took a few closeups. Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 Number 2 Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 Fossil 3 Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 (edited) An old fashioned mortality plate Edited November 18, 2021 by bamontgomery Wrong caption Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 I should have taken some closeups of this one. There's a coating over the trace fossils that obscures them. Not sure what it is. Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 I found these buried with one of the big buys above. I grabbed them because I couldn't tell what they were. Are these chert pieces? What's the seem in them? Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 I grabbed this one in one of the digs as well. The dirt was really caked on, but the color in the second photo was visible and bright pink at the time, so I took it. It required a lot of washing, and it turned out to be...conglomerate. Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 I've been grabbing stuff like this recently in Danville and Crawfordsville thinking it was brecciated jasper. Now I'm thinking that it might just be granite. Any thoughts? Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 Here are a couple of mid sized finds that I thought were jaspers when I took them, but maybe they're chert? There's no real difference between the two though, right? We just call something chert if it's boring jasper? There are some lines in the first picture that become much more apparent when it's wet as well as some holes. I'm not sure what's going on there. Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 I have no idea what this one is, but I don't think that's rust on it. Any ideas? Link to comment Share on other sites More sharing options...
bamontgomery Posted November 18, 2021 Author Share Posted November 18, 2021 One last question! Is there anything I can do about that algae staining without harming the fossils in the first three? Link to comment Share on other sites More sharing options...
abyssunder Posted November 18, 2021 Share Posted November 18, 2021 (edited) In specimen 1-3 there are many crinoid stems, internal molds of lumens and external molds of stems. Picture from here: https://woostergeologists.scotblogs.wooster.edu/2016/04/08/woosters-fossil-of-the-week-a-crinoid-stem-internal-mold-from-the-lower-carboniferous-of-ohio/ Edited November 18, 2021 by abyssunder 2 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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