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Hey guys! It’s been a long time since I’ve been active on the Forum, but I have an exciting update - I just published my first paleontology paper on Christmas Eve! It’s a short paper documenting two shark species that are previously unreported from the LaSalle Limestone of northern Illinois (you guys may know it as the Oglesby roadcut!), Heslerodus divergens and Ossianodus sp. I’ve added the pdf of the paper here and here’s a link to it as well. Thanks to everyone here that helped give info about the site, especially @deutscheben! Gieser_et_al_2023_Kentiana_5.pdf ***Calling all LaSalle Limestone/Oglesby roadcut fossil hunters!*** If you have collected any shark or fish material from the Oglesby roadcut and would be willing to contribute to science and the growing knowledge of the (severely understudied) Paleozoic vertebrate diversity of Illinois, please contact me! Hobbyist fossil collectors have made some of the best finds in paleontology, and I would love to see what you all have collected from the site. This area’s fish diversity is much higher than is currently known to science and I would like to work on documenting it. Thanks! Email - rgieser2_AT_illinois.edu or you can just contact me on this site as well
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I recently have been reanalyzing some fossils I found with @Tales From the Shale and another friend on October 8th, 2022 at a Pennsylvanian era roadcut in Oglesby Illinois! One of the specimens I had previously put under a dissecting scope, but was still unsure about its exact ID. I recently took a look at the specimen again a couple days ago and I believe its a partial tooth of a large ctenacanthiform shark. Here is the specimen under a dissecting scope! After a closer look, I noticed the parts of the tooth that could have connected to the medial cusp and lateral cusp on the left side of the tooth. For comparison, I compared the tooth to other Ctenacanthiform teeth, including cusplets section of the teeth (between the medial cusp and lateral cusp). The number of preserved cusplets on the tooth don't seem to match Gilkmanius (which usually doesn't appear to have cusplets between the medial and lateral cusps) or the other reported bond formation ctenacanthiform Heslerodus. The closet match was Saivodus striatus, but I'm not 100% positive on the ID. Below are some comparison images with a Saivodus striatus tooth. https://www.uky.edu/KGS/fossils/fossil-of-the-month_2022-07_Saivodus.php The first image here shows where I think the lateral cusps are (highlighted with green circles) on the specimen (not dissecting scope images). The second image shows where I believe the medial and lateral cusps would have been located (highlighted with green circles) with the right side being where the medial cusp was and the left side where the left lateral cusp was. Here are the same comparison images but with the dissecting scope. I'm sorry if some of the images are really blurry (still trying to fix my phone's camera). But what do you guys think? Do you guys know for the specimen what would be a good ID for it?
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- bond formation
- brachiopods
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Late August found me traveling to Mazon Creek for a wonderful hunt. See @RandyB's topic, Mazon Creek 8-28-21. The trip allowed a little free time to slip off and explore the road cut in Oglesby, Illinois. This is a very fossiliferous exposure and was enjoyable to explore. The fact I found shark teeth and crinoids makes me think this was a combination of Pennsylvanian La Salle Limestone unit 3 and unit 4. Even though my poor photos do not show it well, the brachiopods are very nice. But unfortunately, identification has been difficult. For those of you, like me, who enjoy geodized fossils, this formation is a great site to visit. Other brachiopods that I couldn't definitively identify. #1 #2 #3 #4 #5
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Pennsylvanian Road Cut Collecting in Oglesby, Illinois (10-5-2020)
Nimravis posted a topic in Fossil Hunting Trips
To day I decided to take a vacation day and stay around the house, but my wife told me that I was getting in her way and why don't I go fossil collecting. So with that, I was off on a 130 mile round trip to Oglesby, Illinois to look around at a road cut that exposes the Pennsylvanian LaSalle Limestone member of the Bond Formation. I have visited this site a number of times before and have prepared trip reports on my finds. I believe I say on every post that this is not a site for young kids and as adults you need to watch yourself for possible falling rocks or falling on the scree that is made up of larger pieces. In my opinion, this site is best visited in the early spring and late fall, when all of the vegetation is dead, it make foot placement a lot easier and really opens up the site, which is not very big. Shortly after I arrived at the site, another car pulled up and a man got out who identified himself as Roy Plotnick. The name was familiar to me, but I could not pinpoint where from, but I knew it was fossil related. Dr. Roy Plotnick is a Professor Emeritus from the University of Illinois at Chicago (Invertebrate Paleobiology and Paleontology), like me, he was just out for a day of collecting. We talked about several topics, including Mazon Creek fossils, and I had mentioned Richardson's Guide to The Fossil Fauna of Mazon Creek book and he stated that he authored the chapter on Eurypterids, and that was when it clicked where I heard his name. We both collected for about 1 hour and then we went on our separate ways. I did not find anything special today and to be honest, this was the least amount of fossils that I ever collected on a trip, here are some finds and pics of the area, Roy and one of me. I asked him to take a picture of me since I usually collect by myself and never end up in pictures. Roy Plotnick- Your's Truly- Pictures of the area- You have to watch out for the branches with the thorns on them, they are deadly. I found this cute little snake hanging around. Composita argentia- Linoproductus cora- Juresania nebrascensis- Crinoid discs- Hash Plate- Something odd and crystal filled, but think it is geological and not fossil. If I am wrong, let me know. I left this piece on site, but I know where it is.- 18 replies
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- lasalle limestone
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Hey guys! It’s been a while since I’ve been active, it’s good to be back My roommate and I took a trip out to Oglesby, IL today for his first fossil hunt! We found some nice brachiopods, but the absolute winner for me were two associated shark teeth (I think). It might be a cladodont, but sharks are really out of my spectrum, so if anyone could help I’d be quite appreciative! Oglesby, IL LaSalle Limestone Member Bond Formation Carboniferous, Pennsylvanian Tooth 1 Tooth 1 wet Tooth 2 Tooth 2 wet
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This was my second time visiting this well-known Late Carboniferous, Kasimovian stage (305-7mya) spot on the NW edge of the Illinois basin. Here are some things I found. Some large brachiopods. After splitting some rocks, came across this nice tooth. I kept both halves for careful extraction/reassembly at home, which took at least a few hours. I don't know much about shark teeth and after researching, and from what I can glean from what scarce information is available, I think it's a Holocephalia subclass, Chimaera tooth. Possibly Cochliodus sp...? It measures 2cm. Correct me if I'm wrong, as I don't know much about teeth. Another cool thing I noticed is that it fluoresces a eerie green under ultraviolet light, however my cell phone camera interprets the UV light differently than my eye. I probably have to mess around with exposure settings or something. Whatever the case, it helps bring out details. Also,, found this genal spine of Ameura sp. with a tooth fragment(dark spot, lower right). I was crossing my fingers that at least the entire cephalon would be there ,but no dice... however, it also fluoresces glow-in-the-dark green which makes it stand out from the matrix easier to photograph. Ahh, to find a complete Ameura that fluoresces.. Thanks for reading.
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On my way out of town after a family gathering at Starved Rock State Park (it was packed like crazy with people, but I was still able to get a quiet hike in early Sunday morning with my mom. The food at the Lodge is not bad at all, also!) I made time to stop by one of my favorite sites, a roadcut near Oglesby, IL. This steep, talus-covered slope is known to produce generous quantities of brachiopods, as well as rarer shark teeth, cephalopods, echinoderms, trilobites and coral, among other things, primarily from the Pennsylvanian La Salle Limestone Member of the Bond Formation. With the wet weather this year plants had grown wildly over the slope, but there was still plenty of rock to explore. I got out of my car, jumped over the little brook running through the ditch, and made my way up the slope. As erosion slowly eats away at the bluff, fresh boulders fall away and expose new things. A large section had fallen last year, and at the top of the slope I saw another section perilously close to breaking away, so I steered well clear of it. Caution is definitely required at this site, especially because of the risk of rock fall near the overhang, but also the danger of slipping on loose rock and falling- a good sense of balance is very helpful! Working my way carefully along the cut I began to find some interesting things. First up was this hash plate- it doesn't look like much here covered in mud, but in the middle are some Archaeocidaris sea urchin spines, and it also features a number of crushed brachiopods, including some with spines, as well as crinoid stem pieces and other bits. I have started cleaning it up, so I will need to take a picture of it after I'm done.
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5/13/19 Oglesby, IL Roadcut- Pennsylvanian shark bits, brachiopods and more
deutscheben posted a topic in Fossil Hunting Trips
A week ago today, I took the day off work to hit one of my favorite sites, a roadcut above the Illinois River in Oglesby, Illinois. This cut exposes the Pennsylvanian LaSalle Limestone member of the Bond Formation and produces abundant brachiopods as well as occasional other fauna including gastropods, cephalopods, coral, trilobites, and shark teeth. The weather was perfect, sunny but not too warm, when I pulled up. The cut is a somewhat unstable slope of cobbles and boulders of varying size, almost all with at least some fossils in them. To get up to the slope, you have to hop across a small ditch with running water. I have a good sampling of the common brachiopods from here, so I am looking for unusual fossils when I go now. I was very happy to quickly find a piece of trilobite as I started to search the rocks at the base of the hill. (I will put pics of everything I brought home in a response post) One interesting find that I was not able to bring home was this Linoproductus brachiopod with some shell preserved and a really pretty dendritic pattern on it- it was very delicate and firmly embedded in the middle of an ~80 lb boulder. I was able to stay for 4 hours, and I felt like I gave most of the site at least a quick look. I am very happy with what I found- I was able to check off many of the rarer things I was looking for, including shark teeth, a trilobite, cephalopod material, and a brachiopod with spines attached, as well as some nice crystallized brachiopods. I will post all of my finds below.- 35 replies
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I posted this find in my trip report thread http://www.thefossilforum.com/index.php?/topic/95184-51319-oglesby-il-roadcut-pennsylvanian-shark-bits-brachiopods-and-more/ but I thought I would put it here too to get some more eyes on it. This piece is from the Pennsylvanian LaSalle Limestone member of the Bond Formation, collected on 5/13 and prepped some over the weekend. At first I thought it was the root of a shark tooth, but as I prepped and revealed the multiple "teeth" on top and the ratio of root to teeth it did not match up. That makes me think it is possibly a part of a jaw with teeth in it, but I have never found anything like that at this site before, nor have I seen any reported from this formation. Any ideas? The scale below is in CM.
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